Man's chief difference from the brutes lies in the exuberant excess of his subjective propensities — his preeminence over them simply and solely in the number and in the fantastic and unnecessary character of his wants, physical, moral, aesthetic, and intellectual. Had his whole life not been a quest for the superfluous, he would never have established himself as inexpugnably as he has done in the necessary.

"Reflex Action and Theism" - The Will to Believe and Other Essays in Popular Philosophy (1897)