Gnostic's believe that Knowledge is God
But that was the very thing that Satan also beguiled Eve to believe in order to eat of the forbidden fruit
"For God knows that when you eat from it your eyes will be opened, and you will be like God, *knowing* good and evil."
But of course that isn't true
but you must not eat from the tree of the knowledge of good and evil, for when you eat from it you will certainly die."
to believe you have the power to control anything by your mind is to fall prey to the same deception that Eve did that led to the spiritual separation of God and man