Moses 3

 Moses is told that - 

"...I, the Lord God, planted the tree of life also in the midst of the garden, and also the tree of knowledge of good and evil."  (Moses 3:9)

In my mind, the Lord's plan and intent becomes apparent as He plants the tree of knowledge of good and evil in the "midst" of the garden.  If he really did not want Adam or Eve to be tempted and to partake, He would have planted it on the outskirts of the garden.

For the plan of salvation to begin, Adam needed knowledge of good and evil.