Start with "The Essential Drucker" - it's a collection of chapters from all his books, and then you can pick out what seems most interesting from that. I'm currently reading "The Post-capitalistic society", which is fascinating, and I recall really enjoying "Innovation and Entrepreneurship" as well. I don't remember where the bit about profits came from - I think it was in The Essential Drucker.

(To be honest, all the business books I read kinda run together in my head, and I'm lucky if I can even remember who said what, let alone where they said it.)