John Calvin Commentary Genesis 1:31

"And God saw everything that he had made, and, behold, it was very good. And there was evening and there was morning, the sixth day." — Genesis 1:31 (ASV)

And God saw everything. Once more, at the conclusion of the creation, Moses declares that God approved of everything that he had made. In speaking of God as seeing, he does so in human terms, for the Lord designed this judgment of his to be a rule and example for us, so that no one should dare to think or speak differently about his works.

For we are not permitted to dispute whether what God has already approved should indeed be approved; rather, it is fitting for us to acquiesce without controversy. The repetition also shows how reckless human audacity is: otherwise, it would have been enough to say, once and for all, that God approved of his works.

But God emphasizes the same thing six times so that he might restrain, as with many bridles, our restless audacity. But Moses expresses more than before, for he adds מאד, (meod), that is, very. On each of the days, simple approval was given. But now, after the workmanship of the world was complete in all its parts and had received, if I may so speak, the last finishing touch, he declares it perfectly good, so that we may know that there is in the symmetry of God’s works the highest perfection, to which nothing can be added.