"What matters is what works."
Pragmatism considers thought an instrument or tool for prediction, problem solving and action, and rejects the idea that the function of thought is to describe, represent, or mirror reality. Pragmatists contend that most philosophical topics—such as the nature of knowledge, language, concepts, meaning, belief, and science—are all best viewed in terms of their practical uses and successes. The philosophy of pragmatism "emphasizes the practical application of ideas by acting on them to actually test them in human experiences". Pragmatism focuses on a "changing universe rather than an unchanging one as the Idealists, Realists and Thomists had claimed". ― Tony Blair
Peirce developed the idea that inquiry depends on real doubt, not mere verbal or hyperbolic doubt, and said, in order to understand a conception in a fruitful way, "Consider the practical effects of the objects of your conception. Then, your conception of those effects is the whole of your conception of the object", which he later called the pragmatic maxim. It equates any conception of an object to the general extent of the conceivable implications for informed practice of that object's effects. This is the heart of his pragmatism as a method of experimentational mental reflection arriving at conceptions in terms of conceivable confirmatory and disconfirmatory circumstances — a method hospitable to the generation of explanatory hypotheses, and conducive to the employment and improvement of verification. Typical of Peirce is his concern with inference to explanatory hypotheses as outside the usual foundational alternative between deductivist rationalism and inductivist empiricism, although he was a mathematical logician and a founder of statistics.
"To be a saint or a man of too good a nature in today's pragmatic world, with everyone out to get the other fellow, was equivalent to being a fool, wasn't it?" ― Shūsaku Endō, Wonderful Fool