“Those who know how to think need no teachers.”

“Change brings opportunity.”

“Doubt that the sun doth move, doubt truth to be a liar, but never doubt I love.”

“Nature has planted in our minds an insatiable longing to see the truth.”

“Generally speaking, if a human being never shows anger, then I think something's wrong. He's not right in the brain.”

“It is absurd to divide people into good and bad. People are either charming or tedious.”