Wisdom is not a product of schooling but of the lifelong attempt to acquire it.

Human beings, in their thinking, feeling and acting are not free agents but are as causally bound as the stars in their motion.

Paper is to write things down that we need to remember. Our brains are used to think.

Science is the attempt to make the chaotic diversity of our sense-experience correspond to a logically uniform system of thought.

Common sense invents and constructs no less than its own field than science does in its domain. It is, however, in the nature of common sense not to be aware of this situation.

The most important human endeavor is the striving for morality in our actions.

Imagination is the highest form of research.