"Old minds are like old horses; you must exercise them if you wish to keep them in working order."

"Because power corrupts, society's demands for moral authority and character increase as the importance of the position increases."

"Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There never was a democracy yet that did not commit suicide."

"Let us tenderly and kindly cherish, therefore, the means of knowledge. Let us dare to read, think, speak, and write."

"Teaching is the only major occupation of man for which we have not yet developed tools that make an average person capable of competence and performance. In teaching we rely on the 'naturals,' the ones who somehow know how to teach."

"Evolution and creationism both require faith. It's just a matter of where you choose to place that faith."

"Faith, there hath been many great men that have flattered the people who ne'er loved them."

"I have great faith in fools; self-confidence my friends call it."