Genesis 13:16

16.And I will make thy seed as the dust. Omitting those subtleties, by means of which others argue about nothing, I simply explain the words to signify, that the seed of Abram is compared to the dust, because of its immense multitude; and truly the sense of the term is to be sought for only in Moses’ own words. It was, however, necessary to be here added, that God would raise up for him a seed, of which he was hitherto destitute. And we see that God always keeps him under the restraint of his own word; and will have him dependent upon his own lips. Abram is commanded to look at the dust; but when he turns his eyes upon his own family, what similitude is there between his solitariness and the countless particles of dust? This authority the Lord therefore requires us to attribute to his own word, that it alone should be sufficient for us. It may also give occasion to ridicule, that God commands Abram to travel till he should have examined the whole land. To what purpose shall he do this, except that he may more clearly perceive himself to be a stranger; and that, being exhausted by continual and fruitless disquietude, he may despair of any stable and permanent possession? For how shall he persuade himself that he is lord of that land in which he is scarcely permitted to drink water, although he has with great labor dug the wells? But these are the exercises of faith, in order that it may perceive, in the word, those things which are far off, and which are hidden from carnal sense. For faith is the beholding of absent things, (Hebrews 11:1,) and it has the word as a mirror, in which it may discover the hidden grace of God. And the condition of the pious, at this days is not dissimilar: for since they are hated by all, are exposed to contempt and reproach, wander without a home, are sometimes driven hither and thither, and suffer from nakedness and poverty, it is nevertheless their duty to lay hold on the inheritance which is promised. Let us therefore walk through the world, as persons debarred from all repose, who have no other resource than the mirror of the word.