All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason. - Immanuel Kant

Kein Mensch ist so wichtig, wie er sich nimmt.

Thus he has two standpoints from which he can consider himself...: first, as belonging to the world of sense, under the laws of nature (heteronomy), and, second, as belonging to the intelligible world under laws which, independent of nature, are not empirical but founded only on reason.

Thoughts without content are empty, intuitions without concepts are blind. The understanding can intuit nothing, the senses can think nothing. Only through their unison can knowledge arise.