Three questions particularly (but not only) directed at malone:
1. I don't follow your hint about the penultimate word in the quote & its significance --- or do you simply mean "referring to those 14 words"?
2. Do you agree that the clash between the endings of 40a & 33d is NOT to be solved by substituting a plural S in both cases?
3. (the 64 million dollar one) In your opinion, is there no connection between the THIRD word in the quote and the 14 "thematically" substituted letters? Would amaze me if so, but can't see anything even after trying to find anagrams of all 28. Am I on a wild goose chase, or is the puzzle simply imperfect???