Philosophy starts with doubt and loves only truth.
Action is coarsened thought; thought becomes concrete, obscure, and unconscious.
At the bottom of the modern man there is always a great thirst for self-forgetfulness, self-distraction . . . and therefore he turns away from all those problems and abysses which might recall to him his own nothingness.
Doubt of the reality of love ends by making us doubt everything.
It is work which gives flavor to life.
Emancipation from error is the condition of real knowledge.