Learning preserves the errors of the past, as well as its wisdom. For this reason, dictionaries are public dangers, although they are necessities.

Every epoch has its character determined by the way its population reacts to the material events which they encounter.

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

No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

The Universe is vast. Nothing is more curious than the self-satisfied dogmatism with which mankind at each period of its history cherishes the delusion of the finality of existing modes of knowledge. Skeptics and believers are alike. At this moment scientists and skeptics are the leading dogmatists. Advance in detail is admitted; fundamental novelty is barred. This dogmatic common sense is the death of philosophic adventure.

A man really writes for an audience of about ten persons. Of course if others like it, that is clear gain. But if those ten are satisfied, he is content.

The 'silly question' is the first intimation of some totally novel development.