Two things awe me most, the starry sky above me and the moral law within me.
There can be no doubt that all our knowledge begins with experience.
There is no virtue in penance and fasting which waste the body; they are only fanatical and monkish.
Art is purposiveness without purpose.
Freedom is that faculty that enlarges the usefulness of all other faculties.
Life is the faculty of spontaneous activity, the awareness that we have powers.