A comparis An analogy for the theory of truth: Consider a black patch on white paper; then we can describe the form of the patch by mentioning, for each point of the surface, whether it is white or black. To the fact that a point is black corresponds a positive fact, to the fact that a point is white (not black) corresponds a negative fact. If I designate a point of the surface (one of Frege's “truth-values”), this is as if I set up an assumption to be decided upon. But in order to be able to say of a point that it is black or that it is white, I must first know when a point is to be called black & when it is to be called white. In order to be able to say that “p” is true (or false), I must first have determined under what circumstances I call a proposition true, & thereby I determine the sense of a proposition. The point [on|in] which the analogy depends fails is this: I can indicate a point of the paper what is white & black, but to a proposition without sense nothing corresponds, for it does not designate a thing (truth-value), whose properties might be called “false” or “true”; the verb of a proposition is not “is true” or “is false”, as Frege believes, but what is true must already contain the verb.