Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me... Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.

Innocence is indeed a glorious thing; but, unfortunately, it does not keep very well and is easily led astray.

All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I to do? 3. What may I hope?

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

Every man is to be respected as an absolute end in himself; and it is a crime against the dignity that belongs to him as a human being, to use him as a mere means for some external purpose.

Enlightenment is man's emergence from his self-incurred immaturity.