The test of a first-rate intelligence is the ability to hold... - John Locke

"The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time."

John Locke Wisdom

Philosopher, Political Theorist English 1632–1704

More from John Locke

"Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours."

"All wealth is the product of labor."

"Freedom is not freedom to do what you like, but freedom to do what you ought."

"The great end of men's actions is some good."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."