1724 - 1804. German. Taught at Univ. of Konigsberg. Influenced by David Hume and Gottfried Wilhem Baron von Leibniz (let's stick with just Leibniz...) Stated that transcendental notions such as divinity and morality, being beyond direct experience, are unprovable and unknowable. Influenced Hegel (and by extension, Karl Marx), and William James.

"Act as if the maxim from which you act were to become through your will a universal law."

Bruces' Philosophers Song