Everything in nature acts in conformity with law.

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

Religion is too important a matter to its devotees to be a subject of ridicule. If they indulge in absurdities, they are to be pitied rather than ridiculed.

Melancholy characterizes those with a superb sense of the sublime.

Maturity is having the courage to use one's own intelligence!

Two things awe me most, the starry sky above me and the moral law within me.

Enlightenment is man's emergence from his self-imposed nonage. Nonage is the inability to use one's own understanding without another's guidance. This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one's own mind without another's guidance. Dare to know!