If you have had your attention directed to the novelties in thought in your own lifetime, you will have observed that almost all really new ideas have a certain aspect of foolishness when they are first produced, and almost any idea which jogs you out of your current abstractions may be better than nothing.

There is no more common error than to assume that, because prolonged and accurate mathematical calculations have been made, the application of the result to some fact of nature is absolutely certain.

Value is coextensive with reality.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

We must not expect simple answers to far-reaching questions. However far our gaze penetrates, there are always heights beyond which block our vision.

The worship of God is not a rule of safety - it is an adventure of the spirit, a flight after the unattainable.

The tragedy of the world is that those who are imaginative have but slight experience, and those who are experienced have feeble imaginations.