Peirce’s 2014 Centennial Congress suggested many ways for “invigorating philosophy for the 21st century.” One may expect Charles S. Peirce’s findings to invigorate logic in particular. Not only did Peirce improve Boole’s algebra, develop a logic of relatives and invent logical quantification, but he drew a whole system of diagrammatic reasoning which may not have born all its fruit yet. He also developed new prospects on informal logic and the theories of induction and abduction. While his inspiration roots in Boole, De Morgan or Schröder, his writings were very influential on Skolem, Hintikka or Polish logic among many, and will probably be on the future of logic.