While many philosophical theists have maintained (correctly or not) that there are data accessible to sense-perception – e.g., the ‘orderly processes of nature’, loving and benevolent human actions – which constitute evidence for the existence of God, it seems unproblematic that there could not conceivably occur sense-perceptions of God. Rather, the properties being God and being sense-perceivable are incompatible, i.e., are such that it is inconceivable for there to exist something which coexemplifies them. This being so, it is nothing short of a necessary truth that if God exists, he is unobservable. In what follows, I shall often express this point in the language of necessity de re by noting that being unobservable is a property that God has essentially; for those at home with ‘possible-world’ semantics, this amounts to the claim that being unobservable is a property that God exemplifies at every possible-world at which he exists. One might reasonably account for this, of course, in terms of God's incorporeality; for it seems unproblemetic that being incorporeal is also a property that God has essentially, and that the function ‘X is incorporeal’ entails the function ‘X is unobservable’. Hence, since ‘If God exists, he is incorporeal’ expresses a necessary truth, it should be intuitively clear that the proposition expressed by ‘If God exists, he is unobservable’ is also a necessary truth.