After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.

No one who achieves success does so without acknowledging the help of others. The wise and confident acknowledge this help with gratitude.

The preternatural solemnity of a good many of the professionally religious is to me a point against them.

The importance of an individual thinker owes something to chance. For it depends upon the fate of his ideas in the minds of his successors.

...the self-satisfied dogmatism with which mankind at each period of its history cherishes the delusion of the finality of existing modes of knowledge.

It must be admitted that there is a degree of instability which is inconsistent with civilization. But, on the whole, the great ages have been unstable ages.

Algebra reverses the relative importance of the factors in ordinary language.