Albert Camus said that, and he was right.

When we become too virtuous, when we think ourselves to be oh, so right, we become dangerous to ourselves and others.
Be careful of those who imagine themselves to be on the High Road while everyone else is walking the Low.
If they really are on the High Road, they will offer to take everyone else with them, not simply tell others that they are going the wrong way.

Neale Donald Walsch