Aristotle

"Well begun is half done."

"We are what we repeatedly do. Excellence, then, is not an act, but a habit."

"Happiness depends upon ourselves."

"It is well to be up and doing."

"The whole is greater than the sum of its parts."

"In all things of nature there is something of the marvelous."

"Knowing yourself is the beginning of all wisdom."

"The more you know, the more you realize you don't know."

"Pleasure in the job puts perfection in the work."

"Without friends, no one would choose to live, even if he had all other goods."

"Man is by nature a social animal."

"A friend to all is a friend to none."

"Love is composed of a single soul inhabiting two bodies."

"A tragedy is thus a representation of an action that is worth serious attention."

"The beauty of the soul shines out when someone smiles."

"Courage is the first of human qualities because it is the quality which guarantees the others."

"There is no great genius without some touch of madness."

"Time crumbles things; everything grows old under the power of Time."

"It is during our darkest moments that we must focus to see the light."

"The unexamined life is not worth living."

"To perceive is to suffer."

"Education is the most powerful weapon which you can use to change the world."

"The law is reason free from passion."

"Nature abhors a vacuum."

"All human actions aim at some good."

"Patience is bitter, but its fruit is sweet."

"We cannot live only for ourselves. A thousand fibers connect us with our fellow men; and among those fibers, as sympathetic threads, our actions run as causes, and they come back to us as effects."

"The aim of the wise is not to secure pleasure, but to avoid pain."

"Anyone can become angry—that is easy. But to be angry with the right person at the right time, and for the right purpose and in the right way—that is not within everyone's power and is not easy."

"It is impossible for a man to learn what he thinks he already knows."