"How can it be that philosophy, being a matter of thinking, is so arduous?"

"What is good is also divine. Queer as it sounds, that sums up my ethics. Only something supernatural can express the Supernatural."

"The limits of empiricism are not where one would expect them to be."

"My work consists of two parts: the one presented here plus all that I have not written. And it is precisely this second part that is the important one."

"If one tried to advance theses in philosophy, it would never be possible to debate them, because everyone would agree to them."