I am continuing here the discussion with Terri in the comments of The Great Stumbling Block, because many folks don't follow threads once they've read the entry once, and the subject deserves its references. I confess that this is not recently researched by me, just writing off the top of my head (Hmm... off the top of one's head. I'll have to look up where that phrase comes from).
Never worry about "taking over" a thread here, so long as you're on topic.
Lewis's most apposite comments are in The Problem of Pain. I warn you in advance that though that particular book is short, it can be tough sledding. While Lewis did not consider himself a professional in philosophy, he clearly had much more training than most of us. Lewis's short books on topics - Miracles, The Four Loves, The Abolition of Man, Mere Christianity are each an education on the topics in themselves. I would type the key paragraphs here, but I'm too lazy. There is a nice summary of Lewis's view of scripture and revelation by Duncan Sprague in the Mars Hill Review, reprinted here. However, I like the way Lewis put it himself better.
Collins's view is less detailed, but similar. His comments on the topic begin on page 206 of The Language of God, if you are thumbing through it in your local Christian bookstore.
As to Augustine, I imagine starting with the Wikipedia article is as good as anywhere else to start. That will connect you on to more detailed info. Two points I bring up on my own. Origen, one of the most important church fathers (2nd Century), thought it was heretical to take a literal view of Genesis, because focusing on historical details would destroy the understanding of the real truth. Exactly what was going to be understood as orthodox and what was to be heretical was still being wrestled out in the church in his time (this was before any of the familiar creeds), so Origen's ideas must be carried lightly. Not all of what he thought became church teaching, but he was the first expositor of much that we consider second nature today.
Martin Luther was a great admirer of Augustine, and believed that most Reformation theology could be found in his works - which is part of why Luther considered that it was the Roman Catholic Church that was leaving him, and not the other way around. At times in the early arguments before the split he "longed" to quote Augustine to the church authorities to prove his points, but wanted to maintain the principle that scripture alone should be enough for all doctrinal understanding.