To be able to concentrate for a considerable time is essential to difficult achievement.

So long as there is death there will be sorrow, and so long as there is sorrow it can be no part of the duty of human beings to increase its amount, in spite of the fact that a few rare spirits know how to transmute it.

This is one of those views which are so absolutely absurd that only very learned men could possibly adopt them.

To think I have spent my life on absolute muck.

Even in the most purely logical realms, it is insight that first arrives at what is new.

The sea, the stars, the night wind in waste places, mean more to me than even the human beings I love best.

[Kant] was like many people: in intellectual matters he was skeptical, but in moral matters he believed imjplicitly in the maximx that he had imbibed at his mother's knee.