Now as to your other story, about Isaiah 66? It doesn’t really matter whether the Bible was open at that page thru’ a miracle or through some (unobserved) natural cause. We think it matters because we tend to call the second alternative ‘chance.’ But when you come to think of it, there can be no such thing as chance from God’s point of view. Since He is omniscient His acts have no consequences which He has not foreseen and taken into account and intended. Suppose it was the draught from the window that blew your Bible open at Isaiah 66. Well, that current of air was linked up with the whole history of weather from the beginning of the world and you may be quite sure that the result it had for you at that moment (like all its other results) was intended and allowed for in the act of creation. ‘Not one sparrow,’ you know the rest [Matthew 10:29]. So of course the message was addressed to you. To suggest that your eye fell on it without this intention, is to suggest that you could take Him by surprise. Fiddle-de-dee! This is not Predestination: your will is perfectly free: but all physical events are adapted to fit in as God sees best with the free actions He knows we are going to do. There’s something about this in Screwtape.
The Collected Letters of C.S. Lewis, Volume III
(An alternate opinion on ‘chance’ from a Catholic philosopher will be offered later.)