Peirce developed the idea that inquiry depends on real doubt, not mere verbal or hyperbolic doubt,[REF] and said, in order to understand a conception in a fruitful way, "Consider the practical effects of the objects of your conception.
Pragmatism enjoyed renewed attention after Willard Van Orman Quine and Wilfrid Sellars used a revised pragmatism to criticize logical positivism in the 1960s.