Matthew 25:40

And the king shall answer, and say unto them
Christ, though a king, and now appearing in great glory and majesty, yet such will be his goodness and condescension, as to return an answer to the queries of his people; blushing and astonished at his notice of their poor services, which they know to be so imperfect, and are always ready to own themselves unprofitable servants; and this he will do in the following manner:

verily I say unto you;
a way of speaking often used by him, when here on earth, when he, in the strongest manner, would asseverate anything as truth, and remove all doubt and hesitation about it.

Inasmuch as ye have done it unto one of the least of these my
brethren, ye have done it unto me:
which is to be understood, not in so limited a sense, as to regard only the apostles, and the least of them, for these were not the only brethren of Christ; nor in so large a sense, as to include all in human nature; but the saints only, the children of God, and household of faith: for though acts of charity and humanity are to be done to all men, yet especially to these; and indeed, these only can be considered as the brethren of Christ, who are born of God, and do the will of Christ; for such he accounts his mother, brethren, and sisters; and who are not only of the same human nature, but in the same covenant with him, and the sons of God, not by nature, as he is the Son of God, but by adoption, and so are heirs of God, and joint-heirs with Christ: now he that does any of the above acts of kindness to these "brethren" of Christ, and because they stand in such a relation to him, even the "least" of them: though he is not an apostle, or a martyr, or a preacher of the Gospel, or has any considerable gifts and abilities for usefulness, but is a weak believer in spiritual things, as well as poor in temporal things; and though it is but to "one" of these opportunity and circumstances not allowing it to be done to more; yet as such is the humility and condescension of this great king, as to account such mean persons his brethren; such also is his grace and goodness, as to reckon every instance of kindness and respect shown to them, as done to himself in person; and will take notice of it, accept and reward it, as if it had been so done.