"Education: the path from cocky ignorance to miserable uncertainty."

"The very ink with which all history is written is merely fluid prejudice, but the stuff with which all history is made is merely fluid ignorance."

"I have been a great many things in my life, but I have never been a hypocrite."

"Always do right. This will gratify some people and astonish the rest."

"Don't wrestle with pigs. You both get dirty and the pig likes it."