Genesis 48:5

5.And now thy two sons. Jacob confers on his son the special privilege, that he, being one, should constitute two chiefs; that is, that his two sons should succeed to an equal right with their uncles, as if they had been heirs in the first degree. But what is this! that a decrepit old man assigns to his grandchildren, as a royal patrimony, a sixth part of the land in which he had entered as a stranger, and from which now again he is an exile! Who would not have said that he was dealing in fables? It is a common proverb, that no one can give what he has not. What, therefore, did it profit Joseph to be constituted, by an imaginary title, lord of that land, in which the donor of it was scarcely permitted to drink the very water he had dug for with great labour, and from which, at length, famine expelled him? But it hence appears with what firm faith the holy fathers relied upon the word of the Lord, seeing they chose rather to depend upon his lips, than to possess a fixed habitation in the land. Jacob is dying an exile in Egypt; and meanwhile, calls away the governor of Egypt from his dignity into exile, that he may be well and happy. Joseph, because he acknowledges his father as a prophet of God, who utters no inventions of his own, esteems as highly the dominion offered to him, which has never yet become apparent, as if it were already in his possession. Moreover, that Jacob commands the other sons of Joseph, (if there should be any,) to be reckoned in the families of these two brothers, is as if he directed them to be adopted by the two whom he adopts to himself.