Posterior Analytics

What does it mean to truly know something? Not to believe it, or suspect it, or argue persuasively for it, but to know it with certainty. Aristotle takes up this question in the Posterior Analytics, and the answer he develops shaped the entire Western tradition of rational thought. This is not a textbook on logic as usually conceived. It is an inquiry into the conditions of scientific knowledge itself: what makes a demonstration valid, what separates demonstration from mere syllogism, what allows us to claim we understand a thing rather than merely being able to argue about it. Aristotle distinguishes between knowledge of the fact and knowledge of the reason why, between definitions that capture essence and those that merely name. He asks what must be true of any discipline that calls itself a science, and in doing so, establishes the foundations on which all subsequent Western epistemology would build. The questions here feel urgent now: in an age of information and misinformation, what separates genuine knowledge from sophisticated persuasion? This is where that inquiry began.