This essay was written for a special issue of Philosophical Topics on the links between Kant and analytic philosophy. It explores these links through consideration of: Wittgenstein’s Tractatus; the logical positivism endorsed by Ayer; and the (very different) variation on that theme endorsed by Quine. It is argued that in all three cases we see analytic philosophers trying to attain and express a general philosophical understanding of why the bounds of sense should be drawn where they should—but thereby confronting the (...) aporia, which Kant too confronted, that it is impossible to do this without transgressing those very bounds. It is suggested in conclusion that the problem is in trying to attain and express such an understanding; in other words, that such an understanding is attainable, but not expressible. (shrink)