“A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him.”

“Betray a friend, and you'll often find you have ruined yourself.”

“Necessity is the mother of invention.”

“All men are more concerned to recover what they lose than to acquire what they lack.”

“Do not waste your pity on a scamp.”

“Better poverty without a care than wealth with its many obligations.”

“The fool doth think he is wise, but the wise man knows himself to be a fool.”

“The secret of life, though, is to fall seven times and to get up eight times.”

“It is the mark of an educated mind to be able to entertain a thought without accepting it.”