True happiness springs from moderation.

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

A great artist... must be shaken by the naked truths that will not be comforted. This divine discontent, this disequilibrium, this state of inner tension is the source of artistic energy.

The philosophers must station themselves in the middle.

When married one has to get into an argument once in a while since in this way one learns about the other.

The deepest, the only theme of human history, compared to which all others are of subordinate importance, is the conflict of skepticism with faith.

We're only really thinking when we can't think out fully what we are really thinking about!