Immaturity is the incapacity to use one's intelligence without the guidance of another.
Two things awe me most, the starry sky above me and the moral law within me.
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
Thoughts without content are empty, intuitions without concepts are blind.
Always recognize that human individuals are ends, and do not use them as means to your end.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
By a lie, a man... annihilates his dignity as a man.
Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.
Science is organized knowledge. Wisdom is organized life.
In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so.
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