Aristotle

"Criticism is something we can avoid easily by saying nothing, doing nothing, and being nothing."

"Give me a place to stand and I can move mountains."

"Anyone can be angry, that is easy. But to be angry with the right person, to the right degree, at the right time, for the right purpose, and in the right way, that is not easy."

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

"We are wiser when older, but we learn more easily when younger."

"Patience is bitter. But its fruit is sweet."

"The one exclusive sign of thorough knowledge is the power of teaching."