And the eyes of them both were opened, and they knew that they were naked; and they sewed fig leaves together, and made themselves aprons.
All Commentaries on Genesis 3:7 Go To Genesis 3
Augustine of Hippo
AD 430
It was not in order to see outward things that “their eyes were opened,” because they could see such things already. It was in order that they might see the difference between the good they had lost and the evil into which they had fallen. That is why the tree is called the tree of the knowledge of good and evil. They had been forbidden to touch it because if they did it would bring on the experience of this distinction. It takes the experience of the pains of sickness to open our eyes to the pleasantness of health.
