PI 89: A nodal point in PI–a point where numerous intimate connections can be traced. I am not going to trace them now, not all of them. But one is that the problem of the sublimity of logic is, at least partially, the result of our subliming of logic, of our relationship to the problem. We are not wholly confused in subliming logic–logic is sublime. But its sublimity must square with its not supplying us with new facts, with its investigation of the hardly memorable and easily forgettable. –Can we so square the sublimity of logic without feeling that Wittgenstein has changed the subject?
These considerations bring us up to the problem: In what sense is logic something sublime?
For there seemed to pertain to logic a peculiar depth–a universal significance. Logic lay, it seemed, at the bottom of all the sciences.–For logical investigation explores the nature of all things. It seeks to see to the bottom of things and is not meant to concern itself whether what actually happens is this or that.—-It takes its rise, not from an interest in the facts of nature, nor from a need to grasp causal connexions: but from an urge to understand the basis, or essence, of everything empirical. Not, however, as if to this end we had to hunt out new facts; it is, rather, of the essence of our investigation that we do not seek to learn anything new by it. We want to understand something that is already in plain view. For this is what we seem in some sense not to understand.
Augustine says in the Confessions “quid est ergo tempus? si nemo ex me quaerat scio; si quaerenti explicare velim, nescio”.–This could not be said about a question of natural science (“What is the specific gravity of hydrogen?” for instance). Something that we know when no one asks us, but no longer know when we are supposed to give an account of it, is something that we need to remind ourselves of. (And it is obviously something of which for some reason it is difficult to remind oneself.)