Genius is talent exercised with courage.

The Christian religion is only for one who needs infinite help, therefore only for one who feels an infinite need. The whole planet cannot be in greater anguish than a single soul. The Christian faith - as I view it - is the refuge in this ultimate anguish. To whom it is given in this anguish to open his heart, instead of contracting it, accepts the means of salvation in his heart.

Logic is not a body of doctrine, but a mirror-image of the world. Logic is transcendental.

Logic must look after itself. In a certain sense, we cannot make mistakes in logic.

If in life we are surrounded by death, so too in the health of our intellect by madness.

Philosophy hasn't made any progress? - If somebody scratches the spot where he has an itch, do we have to see some progress? Isn't genuine scratching otherwise, or genuine itching itching? And can't this reaction to an irritation continue in the same way for a long time before a cure for the itching is discovered?

With my full philosophical rucksack I can only climb slowly up the mountain of mathematics.