It is good to know one's enemy.
It is better to know one's self.

The trouble with competitors' sycophants is they don't know where to put their tongues. Here's a suggestion: Try behind your teeth. With your mouth shut.

It was one of those moments—which sometimes occur only at the interval of years—when a man's moral aspect is faithfully revealed to his mind's eye. Not improbably, he had never before viewed himself as he did now.

When the artist finds himself he is lost. The fact that he has succeeded in never finding himself is regarded by Max Ernst as his only lasting achievement.

The supreme art of war is to subdue the enemy without fighting.

Lies are neither bad nor good. Like a fire they can either keep you warm or burn you to death, depending on how they're used.