What does reason know? Reason only knows what it has succeeded in learning.

My friends, ask gladness from God. Be glad as children, as birds in the sky. And let man's sin not disturb you in your efforts, do not feat that it will dampen your endeavor and keep it from being fulfilled, do not say, Sin is strong, impiety is strong, the bad environment is strong, and we are lonely and powerless, the bad environment will dampen us and keep our good endeavor from being fulfilled. Flee from such despondency, my children! There is only one salvation for you: take yourself up, and make yourself responsible for the sins of men.

How many ideas have there been in the history of man which were unthinkable ten years before they appeared?

There is no explaining anything by reasoning and so it is useless to reason.

If God does not exist, everything is permitted.

You can be sincere and still be stupid.

There is nothing in the world more difficult than candor, and nothing easier than flattery. If there is a hundredth of a fraction of a false note to candor, it immediately produces dissonance, and as a result, exposure. But in flattery, even if everything is false down to the last note, it is still pleasant, and people will listen not without pleasure; with coarse pleasure, perhaps, but pleasure nevertheless.