Quotes by Immanuel Kant

Thoughts without content are empty, intuitions without concepts are blind.

To be is to do.

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

Two things fill me with constantly increasing admiration and awe, the longer and more earnestly I reflect on them: the starry heavens without and the moral law within.

Two things fill the mind with ever new and increasing wonder and awe - the starry heavens above me and the moral law within me.

What can I know? What ought I to do? What can I hope?

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.

The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason.

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.