The clear and distinct perception is the element on which Descartes’s metaphysical certainty is justified. However, the exposition of the skeptical arguments referred to the Cartesian methodical doubt has shown that is necessary to find another justification for the clearness & distinctness criterion. From attempts based on indubitability of the perception or warranty arising from the divine goodness, it will be defended a pragmatist alternative justification.La percepción clara y distinta es el elemento sobre el que se asienta la certeza metafísica de Descartes. Con todo, el planteamiento de los argumentos escépticos referidos a la duda metódica cartesiana ha evidenciado la necesidad de hallar una justificación al propio criterio de la...