There is no stronger test of a person's character than power and authority, exciting as they do every passion, and discovering every latent vice.
PlutarchWhen I myself had twice or thrice made a resolute resistance unto anger, the like befell me that did the Thebans; who, having once foiled the Lacedaemonians (who before that time had held themselves invincible), never after lost so much as one battle which they fought against them.
Plutarch