30 Phil, Chapter 9, Aristotle, Touchstone 25: Logic.
Formal logic is originated in Greece, and Aristotle is considered one of the most important figures in its early development. Aristotle’s work on logic, which is primarily contained in his collection of works known as the, “Organon” (meaning “instrument” or “tool”), formalized many of the principles of deductive reasoning that are still in use today.
