From my quote journal:

Charles Williams, in his analysis of the fall and of redemption, points out that when man learns from the devil to know good and evil, this involves his coming to see good as evil; there is nothing but good for him to see or know. If he is to know evil, it can only be by a distorted vision of what is good. That is how evil is conceived and, in due time, brought to birth.

— Simon Tugwell, The Beatitudes

And it is by a distorted vision of good that we choose what is good at the wrong time, or in the wrong way, or in the wrong amount, or for the wrong reason, or by the wrong means.