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

"It is the nature of the wise to resist pleasures, but the foolish to be a slave to them."

"If a man is unhappy, this must be due to his own fault, that he does not understand that it is in his power to be happy."

"If you are grieved about anything external, it is not the thing itself that troubles you, but your judgment about it. And it is in your power to wipe out this judgment at any moment."

"If you are struck by the appearance of any promised pleasure, guard yourself against being carried away by it; but let this thought wait for you, 'How long will it last, and then how much remorse and …"