A nail is driven out by another nail; habit is overcome by habit. - Erasmus

A remarkable thing happens in the experience of my fools: from them not only true things, but even sharp reproaches, will be listened to; so that a statement which, if it came from a wise man's mouth, might be a capital offense, coming from a fool gives rise to incredible delight. Veracity, you know, has a certain authentic power of giving pleasure, if nothing offensive goes with it; but this the gods have granted only to fools.

What makes a prince a great man, except the consent of his subjects?

The most disadvantageous peace is better than the most just war.