 In short: the components of thoughts can sometimes be analyzed in terms of simpler or more general constituents, in a way that brings to light previously-hidden relations of logical entailment. Hence when we want to know whether a given thought is logically entailed by a set of thoughts, we need to pay attention, from Frege’s point of view, not just to the overall structure exhibited by the sentences expressing those thoughts, but also to the contents of the individual terms that appear in those sentences.