Human, all too human.

We must be physicists in order to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.

Mastery has been achieved when one neither makes a mistake nor hesitates in the performance.

Examine the life of the best and most productive men and nations, and ask yourselves whether a tree which is to grow proudly skywards can dispense with bad weather and storms. Whether misfortune and opposition, or every kind of hatred, jealousy, stubbornness, distrust, severity, greed, and violence do not belong to the favourable conditions without which a great growth even of virtue is hardly possible?

At bottom every man knows well enough that he is a unique being, only once on this earth; and by no extraordinary chance will such a marvelously picturesque piece of diversity in unity as he is, ever be put together a second time.

Well-meaning, helpful, good-natured attitudes of mind have not come to be honored on account of their usefulness, but because they are states of richer souls that are capable of bestowing and have their value in the feeling of the plenitude of life.

A thought comes when it will, not when I will.