“The energy of the mind is the essence of life.”

“The pleasures arising from thinking and learning will make us think and learn all the more. 1153a 23”

“It is the mark of an educated mind to be able to entertain a thought without accepting it.”

“With the truth, all given facts harmonize; but with what is false, the truth soon hits a wrong note.”

“Freedom is obedience to self-formulated rules.”

“Comedy aims at representing men as worse, Tragedy as better than in actual life.”

“Philosophy can make people sick.”

“All men by nature desire knowledge.”

“One swallow does not make a summer, neither does one fine day; similarly one day or brief time of happiness does not make a person entirely happy.”

“For the things we have to learn before we can do them, we learn by doing them.”