Against the common reading that the unforgivable sin is a violation of the sex act, which Neville dismisses as rationalising. His cue comes from what follows the saying in Luke, which looks like an irrelevant change of subject: when they bring you before the synagogues and the rulers, do not be anxious what you are to say, for the Holy Spirit will teach you in that very hour what you OUGHT to say. He will not alter that word - Deuteronomy, Proverbs and Revelation all forbid changing scripture, and 'ought' stands in both the King James and the Revised Standard. Ought implies you need not; man is free to refuse. So the sin against the Holy Spirit is this: brought into the presence of God and supernaturally prompted what to say, the individual refuses to confess his faith. And Neville does not believe anyone will. In his own case the answer came like an echo, and you cannot change an echo however you scream it from canyons. His pastoral conclusion is the point of the lecture: every other sin and every blasphemy is forgiven, so do not be anxious - you will not sin against the Holy Spirit.