“Insanity is often the logic of an accurate mind overtasked. Good mental machinery ought to break its own wheels and levers, if anything is thrust among them suddenly which tends to stop them or reverse their motion. A weak mind does not accumulate force enough to hurt itself; stupidity often saves a man from going mad.”

“Every library should try to complete on something, if it were only the history of pinheads.”

“I hate paying taxes. But I love the civilization they give me”

“When men have realized that time has upset many fighting faiths, they may come to believe... that the ultimate good desired is better reached by free trade in ideas-- that the best test of truth is the power of the thought to get itself accepted in the competition of the market, and that truth is the only ground upon which their wishes safely can be carried out. That at any rate is the theory of our Constitution. It is an experiment. As all life is an experiment. Every year if not every day we wager our salvation upon some prophecy based upon imperfect knowledge. ”

“Where we love is home, home that our feet may leave, but not our hearts.”

“Many ideas grow better when transplanted into another mind than in the one where they sprang up.”

“Trouble makes us one with every human being in the world - and unless we touch others, we're out of touch with life.”

“Language is the blood of the soul into which thoughts run and out of which they grow.”

“The books we read should be chosen with great care, that they may be, as an Egyptian king wrote over his library,'The medicines of the soul.”

“Science is a first-rate piece of furniture for a man's upper chamber, if he has common sense on the ground floor.”

“Science is the topography of ignorance.”