Happiness is not an ideal of reason, but of imagination.

There can be no doubt that all our knowledge begins with experience.

Do the right thing because it is right.

A society that is not willing to demand a life of somebody who has taken somebody else’s life is simply immoral.

How then is perfection to be sought? Wherein lies our hope? In education, and in nothing else.

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!

Freedom can never be comprehended, nor even can insight into it be gained.