There are no vices more dangerous than those which simulate virtue. - Vicesimus Knox

No vice exists which does not pretend to be more or less like some virtue, and which does not take advantage of this assumed resemblance.

We must carefully teach children to detest vices for what they consist in; we must teach them their natural ugliness, so that they flee them not only in their deeds but in their minds: the very thought of them should be hateful, whatever mask they hide behind.

To flee vice is the beginning of virtue, and to have got rid of folly is the beginning of wisdom.