"Other people's views and troubles can be contagious. Don't sabotage yourself by unwittingly adopting negative, unproductive attitudes through your associations with others."

"Every man's life is a warfare, and that long and various."

"What, then, is the fruit of these doctrines? It is the same as that of a vine: leaves, then a blossom, then a ripe cluster. So here, first an appearance, then an impulse, then an act. And the fruit is…"

"Never say about anything, 'I have lost it,' but only, 'I have given it back.'"

"If, however, he has his victim's weakness to exploit, then his efforts are worth his while."