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"It is not enough to be good if you have the ability to be better."

"Our deeds follow us, and what we have been makes us what we are."

"The celebrated Galen said that employment was nature's physician. It is indeed so important to happiness that indolence is justly considered the parent of misery."

"Don't mind criticism. If it is untrue, disregard it; if unfair, keep from irritation; if it is ignorant, smile; if it is justified it is not criticism, learn from it."

"If a man has ten good qualities and one bad one, to look at the ten and forget the one, and if a man has ten bad qualities and one good one, to look at the one and forget the ten."

"He who does not hope to win has already lost."

"Readers are plentiful; thinkers are rare."

"An intelligence test sometimes shows a man how smart he would have been not to have taken it."

"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."

"There is nobody so irritating as somebody with less intelligence and more sense than we have."

"A mind too active is no mind at all."

"I happen to feel that the degree of a person's intelligence is directly reflected by the number of conflicting attitudes she can bring to bear on the same topic."