John Calvin on Genesis 24:7-9

7. The Lord God of heaven. By a twofold argument Abraham infers, that what he is deliberating respecting the marriage of his son will, by the grace of God, have a prosperous issue. First, because God had not led him forth in vain from his own country into a foreign land; and secondly, because God had not falsely promised to give the land, in which he was dwelling as a stranger, to his seed. He might also with propriety be confident that his design should succeed, because he had undertaken it only by the authority, and, as it were, under the auspices of God; for it was his exclusive regard for God which turned away his mind from the daughters of Canaan. He may, however, be thought to have inferred without reason that God would give his son a wife from that country and kindred to which he himself had bidden farewell. But whereas he had left his relatives only at the divine command, he hopes that God will incline their minds to be propitious and favorable to him. Meanwhile he concludes, from the past kindnesses of God, that his hand would not fail him in the present business; as if he would say, “I, who at the command of God left my country, and have experienced his continued help in my pilgrimage, do not doubt that he will also be the guide of thy journey, because it is in reliance on his promise that I lay upon thee this injunction.” He then describes the mode in which assistance would be granted; namely, that God would send his angel, for he knew that God helps his servants by the ministration of angels, of which he had already received many proofs. By calling God the God of heaven, he celebrates that divine power which was the ground of his confidence.