Full Idea
Every man who takes refuge behind the excuse of his passions is a dishonest man.
Gist of Idea
It is dishonest to offer passions as an excuse
Source
Jean-Paul Sartre (Existentialism and Humanism [1945], p.305), quoted by Kevin Aho - Existentialism: an introduction 5 'Core'
Book Reference
Aho,Kevin: 'Existentialism: an introduction' [Polity 2014], p.65
A Reaction
To say 'my passion was so strong that I was too weak to resist it' doesn't sound prima facie dishonest. Sartre's idea is more of an exhortation than a fact, and sounds rather old fashioned and puritan. Do my reasons constitutes excuses?