Book VIII.
Book VIII.
Chapter I.-The Object of Philosophical and Theological Inquiry-The Discovery of Truth.(1)
But the most ancient of the philosophers were not carried away to disputing and doubting, much less are we, who are attached to the really true philosophy, on whom the Scripture enjoins examination and investigation. For it is the more recent of the Hellenic philosophers who, by empty and futile love of fame, are led into useless babbling in refuting and wrangling. But, on the contrary, the Barbarian philosophy, expelling all contention, said, "Seek, and ye shall find; knock, and it shall be opened unto you; ask, and it shall be given you."(2)
Accordingly, by investigation, the point proposed for inquiry and answer knocks at the door of truth, according to what appears. And on an opening being made through the obstacle in the process of investigation, there results scientific contemplation. To those who thus knock, according to my view, the subject under investigation is opened.
And to those who thus ask questions, in the Scriptures, there is given from God (that at which they aim) the gift of the God-given knowledge, by way of comprehension, through the true illumination of logical investigation. For it is impossible to find, without having sought; or to have sought, without having examined; or to have examined, without having unfolded and opened up the question by interrogation, to produce distinctness; or again, to have gone through the whole investigation, without thereafter receiving as the prize the knowledge of the point in question.
But it belongs to him who has sought, to find; and to him to seek, who thinks previously that he does not know. Hence drawn by desire to the discovery of what is good, he seeks thoughtfully, without love of strife or glory, asking, answering, and besides considering the statements made. For it is incumbent, in applying ourselves not only to the divine Scriptures, but also to common notions, to institute investigations, the discovery ceasing at some useful end.
For another place and crowd await turbulent people, and forensic sophistries. But it is suitable for him, who is at once a lover and disciple of the truth, to be pacific even in investigations, advancing by scientific demonstration, without love of self, but with love of truth, to comprehensive knowledge.
Chapter II.-The Necessity of Perspicuous Definition.
What better or clearer method, for the commencement of instruction of this nature, can there be than discussion of the term advanced, so distinctly, that all who use the same language may follow it? Is the term for demonstration of such a kind as the word Blityri, which is a mere sound, signifying nothing? But how is it that neither does the philosopher, nor the orator,-no more does the judge,-adduce demonstration as a term that means nothing; nor is any of the contending parties ignorant of the fact, that the meaning does not exist?
Philosophers, in fact, present demonstration as having a substantial existence, one in one way, another in another. Therefore, if one would treat aright of each question, he cannot carry back the discourse to another more generally admitted fundamental principle than what is admitted to be signified by the term by all of the same nation and language.
Then, starting from this point, it is necessary to inquire if the proposition has this signification or not. And next, if it is demonstrated to have, it is necessary to investigate its nature accurately, of what kind it is, and whether it ever passes over the class assigned. And if it suffices not to say, absolutely, only that which one thinks (for one's opponent may equally allege, on the other side, what he likes); then what is stated must be confirmed. If the decision of it be carried back to what is likewise matter of dispute, and the decision of that likewise to another disputed point, it will go on ad infinitum, and will be incapable of demonstration. But if the belief of a point that is not admitted be carried back to one admitted by all, that is to be made the commencement of instruction. Every term, therefore, advanced for discussion is to be converted into an expression that is admitted by those that are parties in the discussion, to form the starting point for instruction, to lead the way to the discovery of the points under investigation. For example, let it be the term "sun" that is in question. Now the Stoics say that it is "an intellectual fire kindled from the waters of the sea." Is not the definition, consequently, obscurer than the term, requiring another demonstration to prove if it be true? It is therefore better to say, in the common and distinct form of speech, "that the brightest of the heavenly bodies is named the sun." For this expression is more credible and clearer, and is likewise admitted by all.
Chapter III.-Demonstration Defined.
Similarly, also, all men will admit that demonstration is discourse,(3) agreeable to reason, producing belief in points disputed, from points admitted.
Now, not only demonstration and belief and knowledge, but foreknowledge also, are used in a twofold manner. There is that which is scientific and certain, and that which is merely based on hope.
In strict propriety, then, that is called demonstration which produces in the souls of learners scientific belief. The other kind is that which merely leads to opinion. As also, both he that is really a man, possessing common judgment, and he that is savage and brutal,-each is a man. Thus also the Comic poet said that "man is graceful, so long as he is man." The same holds with ox, horse, and dog, according to the goodness or badness of the animal. For by looking to the perfection of the genus, we come to those meanings that are strictly proper. For instance, we conceive of a physician who is deficient in no element of the power of healing, and a Gnostic who is defective in no element of scientific knowledge.
Now demonstration differs from syllogism; in as much as the point demonstrated is indicative of one thing, being one and identical; as we say that to be with child is the proof of being no longer a virgin. But what is apprehended by syllogism, though one thing, follows from several; as, for example, not one but several proofs are adduced of Pytho having betrayed the Byzantines, if such was the fact. And to draw a conclusion from what is admitted is to syllogize; while to draw a conclusion from what is true is to demonstrate.
So that there is a compound advantage of demonstration: from its assuming, for the proof of points in question, true premisses, and from its drawing the conclusion that follows from them. If the first have no existence, but the second follow from the first, one has not demonstrated, but syllogized. For, to draw the proper conclusion from the premisses, is merely to syllogize. But to have also each of the premisses true, is not merely to have syllogized, but also to have demonstrated.
And to conclude, as is evident from the word, is to bring to the conclusion. And in every train of reasoning, the point sought to be determined is the end, which is also called the conclusion. But no simple and primary statement is termed a syllogism, although true; but it is compounded of three such, at the least,-of two as premisses, and one as conclusion.
Now, either all things require demonstration, or some of them are self-evident. But if the first, by demanding the demonstration of each demonstration we shall go on ad infinitum; and so demonstration is subverted. But if the second, those things which are self-evident will become the starting points [and fundamental grounds] of demonstration.
In point of fact, the philosophers admit that the first principles of all things are indemonstrable. So that if there is demonstration at all, there is an absolute necessity that there be something that is self-evident, which is called primary and indemonstrable.
Consequently all demonstration is traced up to indemonstrable faith.(4)
It will also turn out that there are other starting points for demonstrations, after the source which takes its rise in faith,-the things which appear clearly to sensation and understanding. For the phenomena of sensation are simple, and incapable of being decompounded; but those of understanding are simple, rational, and primary. But those produced from them are compound, but no less clear and reliable, and having more to do with the reasoning faculty than the first. For therefore the peculiar native power of reason, which we all have by nature, deals with agreement and disagreement. If, then, any argument be found to be of such a kind, as from points already believed to be capable of producing belief in what is not yet believed, we shall aver that this is the very essence of demonstration.
Now it is affirmed that the nature of demonstration, as that of belief, is twofold: that which produces in the souls of the hearers persuasion merely, and that which produces knowledge.
If, then, one begins with the things which are evident to sensation and understanding, and then draw the proper conclusion, he truly demonstrates. But if [he begin] with things which are only probable and not primary, that is evident neither to sense nor understanding, and if he draw the right conclusion, he will syllogize indeed, but not produce a scientific demonstration; but if [he draw] not the right conclusion, he will not syllogize at all.
Now demonstration differs from analysis. For each one of the points demonstrated, is demonstrated by means of points that are demonstrated; those having been previously demonstrated by others; till we get back to those which are self-evident, or to those evident to sense and to understanding; which is called Analysis. But demonstration is, when the point in question reaches us through all the intermediate steps. The man, then, who practises demonstration, ought to give great attention to the truth, while he disregards the terms of the premisses, whether you call them axioms, or premisses, or assumptions. Similarly, also, special attention must be paid to what suppositions a conclusion is based on; while he may be quite careless as to whether one choose to term it a conclusive or syllogistic proposition.
For I assert that these two things must be attended to by the man who would demonstrate-to assume true premisses, and to draw from them the legitimate conclusion, which some also call "the inference," as being what is inferred from the premisses.
Now in each proposition respecting a question there must be different premisses, related, however, to the proposition laid down; and what is advanced must be reduced to definition. And this definition must be admitted by all. But when premisses irrelevant to the proposition to be established are assumed, it is impossible to arrive at any right result; the entire proposition-which is also called the question of its nature-being ignored.
In all questions, then, there is something which is previously known,-that which being self-evident is believed without demonstration; which must be made the starting point in their investigation, and the criterion of apparent results.
Chapter IV.-To Prevent Ambiguity, We Must Begin with Clear Definition.
For every question is solved from pre-existing knowledge. And the knowledge pre-existing of each object of investigation is sometimes merely of the essence, while its functions are unknown (as of stones, and plants, and animals, of whose operations we are ignorant), or [the knowledge] of the properties, or powers, or (so to speak) of the qualities inherent in the objects. And sometimes we may know some one or more of those powers or properties,-as, for example, the desires and affections of the soul,-and be ignorant of the essence, and make it the object of investigation. But in many instances, our understanding having assumed all these, the question is, in which of the essences do they thus inhere; for it is after forming conceptions of both-that is, both of essence and operation-in our mind, that we proceed to the question. And there are also some objects, whose operations, along with their essences, we know, but are ignorant of their modifications.
Such, then, is the method of the discovery [of truth]. For we must begin with the knowledge of the questions to be discussed. For often the form of the expression deceives and confuses and disturbs the mind, so that it is not easy to discover to what class the thing is to be referred; as, for example, whether the foetus be an animal. For, having a conception of an animal and a foetus, we inquire if it be the case that the foetus is an animal; that is, if the substance which is in the foetal state possesses the power of motion, and of sensation besides. So that the inquiry is regarding functions and sensations in a substance previously known. Consequently the man who proposes the question is to be first asked, what he calls an animal. Especially is this to be done whenever we find the same term applied to various purposes; and we must examine whether what is signified by the term is disputed, or admitted by all. For were one to say that he calls whatever grows and is fed an animal, we shall have again to ask further, whether he considered plants to be animals; and then, after declaring himself to this effect, he must show what it is which is in the foetal state, and is nourished.
For Plato calls plants animals, as partaking of the third species of life alone, that of appetency.(5) But Aristotle, while he thinks that plants are possessed of a life of vegetation and nutrition, does not consider it proper to call them animals; for that alone, which possesses the other life-that of sensation-he considers warrantable to be called an animal. The Stoics do not call the power of vegetation, life.
Now, on the man who proposes the question denying that plants are animals, we shall show that he affirms what contradicts himself. For, having defined the animal by the fact of its nourishment and growth, but having asserted that a plant is not an animal, it appears that he says nothing else than that what is nourished and grows is both an animal and not an animal.
Let him, then, say what he wants to learn. Is it whether what is in the womb grows and is nourished, or is it whether it possesses any sensation or movement by impulse? For, according to Plato, the plant is animate, and an animal; but, according to Aristotle, not an animal, for it wants sensation, but is animate. Therefore, according to him, an animal is an animate sentient being. But according to the Stoics, a plant is neither animate nor an animal; for an animal is an animate being. If, then, an animal is animate, and life is sentient nature, it is plain that what is animate is sentient. If, then, he who has put the question, being again interrogated if he still calls the animal in the foetal state an animal on account of its being nourished and growing, he has got his answer.
But were he to say that the question he asks is, whether the foetus is already sentient, or capable of moving itself in consequence of any impulse, the investigation of the matter becomes clear, the fallacy in the name no longer remaining. But if he do not reply to the interrogation, and will not say what he means, or in respect of what consideration it is that he applies the term "animal" in propounding the question, but bids us define it ourselves, let him be noted as disputatious.
But as there are two methods, one by question and answer, and the other the method of exposition, if he decline the former, let him listen to us, while we expound all that bears on the problem. Then when we have done, he may treat of each point in turn. But if he attempt to interrupt the investigation by putting questions, he plainly does not want to hear.
But if he choose to reply, let him first be asked, To what thing he applies the name, animal. And when he has answered this, let him be again asked, what, in his view, the foetus means, whether that which is in the womb, or things already formed and living; and again, if the foetus means the seed deposited, or if it is only when members and a shape are formed that the name of embryos is to be applied. And on his replying to this, it is proper that the point in hand be reasoned out to a conclusion, in due order, and taught.
But if he wishes us to speak without him answering, let him hear. Since you will not say in what sense you allege what you have propounded (for I would not have thus engaged in a discussion about meanings, but I would now have looked at the things themselves), know that you have done just as if you had propounded the question, Whether a dog were an animal? For I might have rightly said, Of what dog do you speak? For I shall speak of the land dog and the sea dog, and the constellation in heaven, and of Diogenes too, and all the other dogs in order. For I could not divine whether you inquire about all or about some one. What you shall do subsequently is to learn now, and say distinctly what it is that your question is about. Now if you are shuffling about names, it is plain to everybody that the name foetus is neither an animal nor a plant, but a name, and a sound, and a body, and a being, and anything and everything rather than an animal. And if it is this that you have propounded, you are answered.
But neither is that which is denoted by the name foetus an animal. But that is incorporeal, and may be called a thing and a notion, and everything rather than an animal. The nature of an animal is different. For it was clearly shown respecting the very point in question, I mean the nature of the embryo, of what sort it is. The question respecting the meanings expressed by the name animal is different.
I say, then, if you affirm that an animal is what has the power of sensation and of moving itself from appetency, that an animal is not simply what moves through appetency and is possessed of sensation. For it is also capable of sleeping, or, when the objects of sensation are not present, of not exercising the power of sensation. But the natural power of appetency or of sensation is the mark of an animal. For something of this nature is indicated by these things. First, if the foetus is not capable of sensation or motion from appetency; which is the point proposed for consideration. Another point is; if the foetus is capable of ever exercising the power of sensation or moving through appetency. In which sense no one makes it a question, since it is evident.
But the question was, whether the embryo is already an animal, or still a plant. And then the name animal was reduced to definition, for the sake of perspicuity. But having discovered that it is distinguished from what is not an animal by sensation and motion from appetency; we again separated this from its adjuncts; asserting that it was one thing for that to be such potentially, which is not yet possessed of the power of sensation and motion, but will some time be so, and another thing to be already so actually; and in the case of such, it is one thing to exert its powers, another to be able to exert them, but to be at rest or asleep. And this is the question.
For the embryo is not to be called an animal from the fact that it is nourished; which is the allegation of those who turn aside from the essence of the question, and apply their minds to what happens otherwise. But in the case of all conclusions alleged to be found out, demonstration is applied in common, which is discourse (logov), establishing one thing from others. But the grounds from which the point in question is to be established, must be admitted and known by the learner. And the foundation of all these is what is evident to sense and to intellect.
Accordingly the primary demonstration is composed of all these. But the demonstration which, from points already demonstrated thereby, concludes some other point, is no less reliable than the former. It cannot be termed primary, because the conclusion is not drawn from primary principles as premisses.
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