   An important note at this juncture is that Reid very infrequently uses contemporary epistemological terms such as “knowledge”, “rational”, or “justified”, and even when he does, he does not offer necessary and sufficient conditions for their definition. Reid says above that sensations caused by primary qualities “inform us” of the qualities in the objects that caused them. One ought not look to Reid's epistemology for a detailed formal apparatus clearly identifying his externalism about justification, for example, even though he can be credited with bringing what we now call externalism about justification into Early Modern philosophy.