‘Logic’ (pub. 28.02.18-11:41). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-logic-theory-reasoning-part-i-exact-logic-introduction-what-logic.
Quote:
Logic is the Theory of Reasoning. Its main business is to ascertain the conditions upon which the just strength of reasoning depends.
Source:
Peirce, C. S. (1897 [c.]). Logic. The Theory of Reasoning. Part I. Exact Logic. Introduction. What is Logic. MS [R] 735.
URL:
http://www.commens.org/dictionary/entry/quote-logic-theory-reasoning-part-i-exact-logic-introduction-what-logic