It is precisely in knowing its limits that philosophy consists.

For how is it possible, says that acute man, that when a concept is given me, I can go beyond it and connect with it another which is not contained in it, in such a manner as if that latter necessarily belonged to the former?

The inscrutable wisdom through which we exist is not less worthy of veneration in respect to what it denies us than in respect to what it has granted.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.

God, freedom, and immortality are untenable in the light of pure reason.

But only he who, himself enlightened, is not afraid of shadows.

Act in such a way that you will be worthy of being happy.