Full Idea
Man is a useless passion.
Gist of Idea
Man is a useless passion
Source
Jean-Paul Sartre (Being and Nothingness [1943], IV.2.III)
Book Reference
Sartre,Jean-Paul: 'Being and Nothingness' [Routledge 2003], p.636
A Reaction
Memorable and neat. Since all of existence is ultimately 'useless', that part of it is not a revelation. The notion that we are essentially a 'passion' chimes nicely with David Hume's view, against the enlightenment rational view, and against Aristotle.