Man must suffer to be wise.
The shifts of fortune test the reliability of friends.
The roots of knowledge are bitter, but its fruit are sweet.
It is the soul itself which sees and hears, and not those parts which are, as it were, but windows to the soul.
Take from a man his reputation for probity, and the more shrewd and clever he is, the more hated and mistrusted he becomes.
Death approaches, which is always impending like the stone over Tantalus: then comes superstition with which he who is imbued can never have peace of mind.