There is no virtue in penance and fasting which waste the body; they are only fanatical and monkish.

Here I shall add that the concept of change, and with it the concept of motion, as change of place, is possible only through and in the representation of time. & Motion, for example, presupposes the perception of something movable. But space considered in itself contains nothing movable; consequently motion must be something which is found in space only through experience -in other words, is an empirical datum.

Two things strike me dumb: the infinite starry heavens, and the sense of right and wrong in man.

The business of philosophy is not to give rules, but to analyze the private judgments of common reason.

Notion without intuition is empty, intuition without notion is blind.

Freedom is that faculty that enlarges the usefulness of all other faculties.

In the mere concept of one thing it cannot be found any character of its existence.