The Devil Sends Errors Into The World In Pairs.
"I feel a strong desire to tell you - and I expect you feel a strong desire to tell me - which of these two errors is the worse. That is the devil getting at us. He always sends errors into the world in pairs - pairs of opposites. And he always encourages us to spend a lot of time thinking which is the worse. You see why, of course? He relies on your extra dislike of one error to draw you gradually into the opposite one. But do not let us be fooled. We have to keep our eyes on the goal and go straight through between both errors. We have no other concern than that with either of them." (C.S. Lewis, Mere Christianity)