Evidence

"Pragmatism is the principle that every theoretical judgment expressible in a sentence in the indicative mood is a confused form of thought whose only meaning, if it has any, lies in its tendency to enforce a corresponding practical maxim expressible as a conditional sentence having its apodosis in the imperative mood." - Charles Sanders Peirce, Pragmatism as a Principle and Method of Right Thinking: The 1903 Harvard Lectures on Pragmatism