Genesis 3:22
And the LORD God said, “The man has now become like one of us, knowing good and evil. He must not be allowed to reach out his hand and take also from the tree of life and eat, and live forever.”
Adam did not have the knowledge of good and evil pre-fall and sinned, Jesus had the knowledge of good and evil and did not sin.
What does that mean to you?
Well, whatever this knowledge is, it cannot be evil, because scripture confirms that God has this knowledge. So, this does not prove that man became depraved.
Before the fall, man had only knowledge of good, after the fall he had knowledge of evil also.
The scriptures say as soon as they ate their eyes were opened and they knew they were naked. So, I believe this shows for the first time they became aware of themselves, self-conscious. We all know a little baby can walk around the house completely naked and not feel shame or embarrassment. But in a few short years a child becomes aware of himself and wants to be clothed.
So, I believe this shows man became self aware, especially of his own faults. Some have argued this is when man gained a conscience, and this may well be true. The conscience knows between good and evil and commends a man when he does good, but condemns a man when he does evil.
Jhn 8:9 And they which heard it,
being convicted by their own conscience, went out one by one, beginning at the eldest, even unto the last: and Jesus was left alone, and the woman standing in the midst.
Here, the conscience of these men convicted them.
Acts 23:1 And Paul, earnestly beholding the council, said, Men and brethren,
I have lived in all good conscience before God until this day.
Here Paul says he lived in all good conscience before God. Paul could not be saying he lived his whole life without sin, but was speaking of his preaching the gospel, that he did not feel guilty or wrong for doing so, he knew he was teaching the truth.
So, I believe this self awareness and the ability to judge one's self whether they have done good or evil is what the knowledge of good and evil is. Before this, Adam and Eve were like little children who were completely unaware of themselves or their actions.