Valid

Miracles 3.6 Valid(ity) -- the correspondence between Reality and our thought which produces Theory -- essentially a pattern of explanation. "A theory which explained everything else in the whole universe but which made it impossible to believe that our thinking was valid, would be utterly out of court." Note: it was Lewis's use of "valid" that got him into his argument with Anscombe. One would speculate that since this is the rewritten version of Chapter 3 of Miracles, that he is using "valid" with greater care. Here he is saying that validity is the correspondence between our thought as reality. If that correspondence is not present then our thought is not valid.