A little while ago I thought the ontological argument dead and buried beyond any possible hope of resurrection and no philosophical event has caused me much greater surprise than its revival by a member of the very linguistic school to whose line of thinking it seemed most alien and who were held to have given it its quietus once for all. I am tempted to welcome any relapse into metaphysics by a member of this school as being some sign of grace, but on this issue I must for once take sides with the prevailing tradition against at least this kind of metaphysics. Let me make clear, however, what it is I am combating. The term ‘ontological argument’ has been used for arguments which its original supporters would certainly not have recognised as theirs. It has been used for instance to stand for the claim that it is an essential presupposition of thought that what we must think is true of the real, a claim which could not be used to prove the existence of God unless we had available another proof that we really must think that God exists. It has been used for kinds of ‘idealist’ arguments which I do not want to discuss here. It has been used for the argument that the idea of a perfect being cannot be explained as derived from any other idea and must therefore be explained as produced in us by a being who really is perfect, an argument which appears in Descartes side by side with the ontological argument but which he carefully distinguishes from it.