Experience without theory is blind, but theory without experience is mere intellectual play.
Always recognize that human individuals are ends, and do not use them as means to your end.
From such crooked wood as that which man is made of, nothing straight can be fashioned.
Immanuel Kant (1724 – 1804) was a German philosopher from Prussia who researched, lectured and wrote on philosophy and anthropology during the Enlightenment at the end of the 18th century. His major work, the Critique of Pure Reason aimed to unite reason with experience to move beyond what he took to be failures of traditional philosophy and metaphysics.