“To overestimate the originality of one's thoughts is perhaps a less serious defect than being unaware of their newness. There is a more pronounced lack of sensitivity in underestimating (ourselves and others) than in overestimating.”

“Never underestimate your power to change yourself; never overestimate your power to change others.”

“If you are insecure, guess what? The rest of the world is too. Do not overestimate the competition and underestimate yourself. You are better than you think.”

“If you are insecure, guess what? The rest of the world is, too. Do not overestimate the competition and underestimate yourself. You are better than you think.”

“A friend should always underestimate your virtues and an enemy overestimate your faults”

“Most people overestimate what they can do in one year and underestimate what they can do in ten years.”

“We are prone to overestimate how much we understand about the world and to underestimate the role of chance in events.”

“I am constantly overestimating and underestimating the human race - that rarely do I ever simply estimate it.”

“An intelligent woman herself, the Duchess had overestimated the Marshal’s intelligence. Not an ambitious woman, she had underestimated his ambition. So are many misread by other’s lights.”

“We tend to overestimate what we can do in the short term and underestimate what we can do in the long term.”