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“Those who make the worst use of their time are the first to complain of its brevity.”
― Jean de La Bruyère, Les Caractères

“A man who dares to waste one hour of time has not discovered the value of life.”
― Charles Darwin, The Life & Letters of Charles Darwin

“Never waste a minute thinking about people you don't like.”
― Dwight D. Eisenhower

“There is no greater sorrow
Than to recall a happy time
When miserable.”
― Dante Alighieri