29.But I know him. When he says that he knoweth God, he means that it is not without good grounds that he has risen to so great confidence; and by his example he warns us not to assume lightly the name of God, so as to vaunt of Him as the patron and defender of our cause. For many are too presumptuous in boasting of the authority of God; and, indeed, it is impossible to imagine greater readiness and boldness in rejecting the opinions of all men, than is to be found among fanatics who give out their own inventions as the oracles of God. But we are taught by these words of our Lord Jesus Christ that we ought especially to beware of proud and foolish confidence; and that, when we have fully ascertained the truth of God, we ought boldly to resist men. And he who is fully aware that God is on his side has no reason to dread the charge of being insolent, in trampling under foot all the haughtiness of the world.
Because I am from him, and he hath sent me. Some distinguish these two clauses in this manner. They refer the former clause — I am from him — to the Divine essence of Christ; and the latter clause — he hath sent me — to the office enjoined on him by the Father, for the sake of executing which he took upon him the flesh and human nature. Though I do not venture to reject this view, still I do not know if Christ intended to speak so abstrusely. I readily acknowledge that Christ’ heavenly descent may be inferred from it, but it would not be a sufficiently strong proof of his eternal Divinity against the Arians.