If we take in our hand any volume ; of divinity or school metaphysics, for instance ; let us ask, « Does it contain any abstract reasoning concerning quantity or number ? » No. « Does it contain any experimental reasoning concerning matter of fact and existence ? » No. Commit it then to the flames : for it can contain nothing but sophistry and illusion.
Treatise Concerning Human Understanding.

Hume, David (1711 - 1776)