Genesis 3

"Thus, with freedom and responsibility comes a test of obedience in the prohibition placed on eating from the tree of the knowledge of good and evil. Nothing in the text suggests that the fruit of this tree (which is never referred to as an apple tree!) has some magical quality which will produce the knowledge of good and evil in anyone who eats it. This would be completely out of Character for biblical literature. It is more likely that God designates the tree as off limits as the means of showing the difference between good and evil. The choice for Adam and Eve was not between ignorance and the knowledge of good and evil, but between remaining good and becoming evil themselves. The nature of the test was such that whatever choice they made they would know both good and evil."

Graeme Goldsworthy, According to Plan, Pg. 98