“Doubt is not a pleasant condition, but certainty is an absurd one.”

“What is tolerance? It is the consequence of humanity. We are all formed of frailty and error; let us pardon reciprocally each other's folly — that is the first law of nature.”

“Men will always be mad, and those who think they can cure them are the maddest of all.”

“Let us cultivate our garden.”

“It is the privilege of true genius, and certainly of the genius that opens a new road, to make without punishment great mistakes.”

“It is better to risk sparing a guilty person than to condemn an innocent one.”

“Optimism is the faith that leads to achievement; nothing can be done without hope.”

“One can never consent to creep when one feels an impulse to soar.”

“When one door of happiness closes, another opens; but often we look so long at the closed door that we do not see the one which has been opened for us.”

“You may never know what results come of your actions. But if you do nothing, there will be no result.”

“What man actually needs is not a tensionless state but rather the striving and struggling for some goal worthy of him. What he needs is not the discharge of tension at any cost, but the call of a potential meaning waiting to be fulfilled by him.”

“The time is always right to do what's right.”