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If man makes himself a worm he must not complain when he is trodden on.

Immaturity is the incapacity to use one's intelligence without the guidance of another.

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.

Ingratitude is the essence of vileness.

Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.

It is beyond a doubt that all our knowledge that begins with experience.

It is not God's will merely that we should be happy, but that we should make ourselves happy.

It is not necessary that whilst I live I live happily; but it is necessary that so long as I live I should live honourably.

Live your life as though your every act were to become a universal law.

May you live your life as if the maxim of your actions were to become universal law.