Bad mind, bad heart.
(Mals Mens, Malus Animus)

What is man's chief enemy? Each man is his own.

Wise men argue cases, fools decide them.

Written laws are like spiders' webs, and will, like them, only entangle and hold the poor and weak, while the rich and powerful will easily break through them.

Every man is his own chief enemy.

Play so that you may be serious.