  The importance of language in Buridan's philosophy emerges on many levels, all of which are driven by his pedagogical aims. In logic, grammatical rules are explicitly subsumed as necessary conditions of the science (scientia) of logic, so that although the logician's notion of truth and the grammarian's notion of congruence are separable in theory, in practice the complete significance of a piece of discourse cannot be determined without both. Context is crucial to interpretation: