 The American philosopher, logician and scientist Charles Sanders Peirce (1839–1914) is generally recognized for first proposing a “pragmatic” theory of truth. Peirce’s pragmatic theory of truth is a byproduct of his pragmatic theory of meaning. In a frequently-quoted passage in “How to Make Our Ideas Clear” (1878), Peirce writes that, in order to pin down the meaning of a concept, we must: