Truth happens to an idea. It becomes true, is made true by events. Its verity is in fact an event, a process: the process namely of its verifying itself, its veri-fication. Its validity is the process of its valid-ation.

Science must constantly be reminded that her purposes are not the only purposes and that the order of uniform causation which she has use for, and is therefore right in postulating, may be enveloped in a wider order, on which she has no claim at all.

To consider hypotheses is surely always better than to dogmatize ins blaue hinein

Experience, as we know, has a way of boiling over, and making us correct our present formulas.

Plasticity, then, in the wide sense of the word, means the possession of a structure weak enough to yield to an influence, but strong enough not to yield all at once. Each relatively stable phase of equilibrium in such a structure is marked by what we may call a new set of habits.

Philosophy lives in words, but truth and fact well up into our lives in ways that exceed verbal formulation.

We have to live today by what truth we can get today and be ready tomorrow to call it falsehood.