Man's chief difference from the brutes lies in the exuberant excess of his subjective propensities. Prune his extravagance, sober him, and you undo him.

Faith is synonymous with working hypothesis.

Every way of classifying a thing is but a way of handling it for some particular purpose.

... A rule of thinking which would absolutely prevent me from acknowledging certain kinds of truth if those ... truths were really there, would be an irrational rule.

Truth in our ideas means their power to work.

Most people live, whether physically, intellectually or morally, in a very restricted circle of their potential being.

Woe to him whose beliefs play fast and loose with the order which realities follow in his experience; they will lead him nowhere or else make false connections