Without adventure civilization is in full decay. ... The great fact [is] that in their day the great achievements of the past were the adventures of the past.

It is impossible to meditate on time and the mystery of nature without an overwhelming emotion at the limitations of human intelligence.

No reason can be given for the nature of God, because that nature is the ground of rationality.

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

Our reasonings grasp at straws for premises and float on gossamers for deductions.

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.

Learning is often spoken of as if we are watching the open pages of all the books which we have ever read, and then, when occasion arises, we select the right page to read aloud to the universe.