"The most important thing in life is to know how to live."

"Bore: one who has the power of speech but not the capacity for conversation."

"We can know nothing of humankind without knowing something of ourselves. Self-knowledge is the property of those people whose passions have their full play, but who ponder over their results."

"He was distinguished for ignorance; for he had only one idea, and that was wrong."

"The most fatal error possible in politics is that of ignoring the spirit of the age."