Isaiah 30:8, and Neville took it for the title page of The Law and the Promise: and now, go, write it before them on a tablet and inscribe it in a book that it may be for the time to come as a witness forever. He is explicit about why - that I would inscribe it in the book, whether one believed it or not. About four lectures. What gives the verse its force is the company it keeps three lines later, which he quotes whenever the eighth verse comes up: for they are a rebellious people, lying sons, sons who will not hear the instruction of the Lord; who say to the seers, See not, and to the prophets, Prophesy not to us what is right; speak to us smooth things, prophesy illusions. He identifies the lying sons as reason - they took everything that night, the setting sun, the dusk, the absence of the news from the radio, to persuade you that you had not seen what you actually saw - and he sets himself against the demand: I am not sent to tell you the smooth things or the pleasing things. So the instruction to inscribe it is a response to being disbelieved, and the book exists because the seers are told see not.