John Calvin on Genesis 16:7

7. And the angel of the Lord found her . We are here taught with what clemency the Lord acts towards his own people, although they have deserved severe punishment. As he had previously mitigated the punishment of Abram and Sarai, so now he casts a paternal look upon Hagar, so that his favor is extended to the whole family. He does not indeed altogether spare them, lest he should cherish their vices; but he corrects them with gentle remedies. It is indeed probable, that Hagar, in going to the desert of Sur, meditated a return to her own country. Yet mention seems to be made of the desert and the wilderness, to show that she, being miserably afflicted, wandered from the presence of men, till the angel met her. Although Moses does not describe the form of the vision, yet I do not doubt, that it was clothed in a human body; in which, nevertheless, manifest tokens of celestial glory were conspicuous.