Perhaps one of the most important and widely used axioms in philosophy. What is it? What does it mean and how does it work? Gentleman Thinker playlist: https://www.youtube.com/watch?v=94YV6Lu009k&list=PLvoAL-KSZ32cKobolNFwuqcPJ26cmF_11&index=1 Facebook: https://www.facebook.com/PhilosophyTube?ref=hl Twitter: https://twitter.com/PhilosophyTube Email: ollysphilosophychannel@gmail.com