On the Life of the Wise Man made perfect by Instruction or, on the Unwritten Law, that is to say, on Abraham (171-175)

And when, looking as it were from a watch-tower, he saw the appointed place afar off, he bade his servants remain there, and he gave his son the fire and the wood to carry, thinking it proper for the victim himself to be burdened with the materials for the sacrifice, a very light burden, for nothing is less troublesome than piety.

And as they proceeded onwards with equal speed, not marching more rapidly with their bodies than with their minds along that short road of which holiness is the end, they at last arrive at the appointed place.

And the father collected stones wherewith to build the altar; and when his son saw everything else

Therefore, any other father, knowing what he was about to do, and being depressed in his soul, would have been thrown into confusion by his son’s words, and being filled with tears, would, out of his excessive affliction, by his silence have betrayed what was about to be done;

but Abraham, betraying no alteration of voice, or countenance, or intention, looking at his son with steady eye, answered his question with a determination more steady still, "My child," said he, "God will provide himself a victim for the burnt offering," although we are in a vast desert where perhaps you despair of such a thing being found; but all things are possible to God, even all such things as are impossible and unintelligible to men.