Philippians 3:12

Not as though I had already attained
Or "received"; he had received much grace out of the fulness of it in Christ; he had received the gift of righteousness, the forgiveness of his sins, and the adoption of children; he had attained to a lively hope of the incorruptible inheritance, and had received a right unto it, and had a meetness for it; but as yet he had not received the thing itself, nor was he come to the end of his race, and so had not received the crown of righteousness laid up for him; he had not yet attained to perfect knowledge, nor perfect holiness, nor perfect happiness: wherefore he adds,

either were already perfect;
he was perfect in comparison of others, that were in a lower class of grace, experience, and knowledge, in which sense the word is used in ( Philippians 3:15 ) , and in ( 1 Corinthians 2:6 ) ; he was so, as perfection intends sincerity, uprightness, and integrity; the root of the matter, the truth of grace was in him; his faith was unfeigned, his love was without dissimulation, his hope was without hypocrisy, his conversation in the world was in godly simplicity, and his preaching and his whole conduct in his ministry were of sincerity, and in the sight of God: he was perfect as a new creature with respect to parts, having Christ formed in him, and all the parts of the new man, though not as to degrees; this new man not being as yet grown up to a perfect man, or to its full growth, to the measure of the stature of the fulness of Christ; he was perfect with respect to justification, being perfectly justified from all things, by the righteousness of Christ, but not with respect to sanctification; and though his sanctification was perfect in Christ, yet not in himself; his knowledge was imperfect, something was wanting in his faith, and sin dwelt in him, of which he sometimes grievously complained: now this he says, lest he should be thought to arrogate that to himself, which he had not:

but I follow after;
Christ the forerunner, after perfect knowledge of him, perfect holiness from him, and perfect happiness with him: the metaphor is taken from runners in a race, who pursue it with eagerness, press forward with all might and main, to get up to the mark, in order to receive the prize; accordingly the Syriac version renders it, (ana jhr) , "I run", and so the Arabic: the apostle's sense is, that though he had not yet reached the mark, he pressed forward towards it, he had it in view, he stretched and exerted himself, and followed up very closely to it, in hope of enjoying the prize:

if that I may apprehend that for which also I am apprehended of
Christ Jesus;
he was apprehended of Christ, when he met him in his way to Damascus, stopped him in his journey, laid him prostrate on the ground, and laid hold on him as his own, challenged and claimed his interest in him, ( Acts 9:3-6 ) ( 26:13-18 ) , as one that the Father had given him, and he had purchased by his blood; he entered into him, and took possession of him, and took up his residence in him, having dispossessed the strong man armed, and ever since held him as his own; and he apprehended, or laid hold on him, to bring him as he had engaged to do, to a participation of grace here, and glory hereafter; that he might know him himself, and make him known to others; that he might be made like unto him, have communion with him, and everlastingly enjoy him: and these things the apostle pursued after with great vehemence, that he might apprehend them, and be in full possession of them; and which he did, in the way and manner hereafter described.