Mark 13:21, and Neville endorses it without qualification: if anyone, no matter who he is, says to you, look, here is the Christ, or look, there he is, do not believe it. He then does the thing that makes the verse hard, which is to apply it to himself in the same breath - this night I'm going to share him with you, but I can't point to another and I can't point to myself, and yet I will share him with you. The reason given at 1208 and 1242 is the one from the first letter of John: it does not yet appear what we shall be, but we know that when he does appear we shall be like him, and see him as he is - so no present appearance can be the thing, because the thing has not appeared. He joins it to the second commandment, make no graven image, and extends the prohibition inward: make no mental image of any being external to yourself as Christ Jesus, for you're only having an idol, and an idol has no power, none whatsoever. At 1553 it sits where Mark puts it, among the wars and rumours of wars and the earthquakes, as one of the signs that is not the end; at 1776 it is the charge that man will not obey the commandment and makes images after images after images; at 1829 it comes with the assurance that replaces the pointing - you will know, and this knowledge that comes to you from within is without uncertainty. About eight lectures. Its practical child is the rule about holy men.