To receive applause for works which do not demand all our powers hinders our advance towards a perfecting of our spirit. It usually means that thereafter we stand still
One of the symptoms of an approaching nervous breakdown is the belief that one's work is terribly important
Every man is the son of his own works
It is not sufficient to see and to know the beauty of a work. We must feel and be affected by it
I attempt an arduous task; but there is no worth in that which is not a difficult achievement


On Anger: "For every minute you remain angry, you give up sixty seconds of peace of mind."
On Destiny: "Our destiny exercises its influence over us even when, as yet, we have not learned its nature: it is our future that lays down the law of our today."
Human, All Too Human
On Friendship: "A crowd is not company; and faces are but a gallery of pictures; and talk but a tinkling cymbal, where there is no love."