"Hell is full of good intentions."

Next Quote

The plea of good intentions is not one that can be allowed to have much weight in passing historical judgment upon a man whose wrong-headedness and distorted way of looking at things produced, or helped to produce, such incalculable evil; there is a wide political applicability in the remark attributed to a famous Texan, to the effect that he might, in the end, pardon a man who shot him on purpose, but that he would surely never forgive one who did so accidentally.

— Theodore Roosevelt