I've read a boat load of business books and I don't remember a lot of the specifics in the books but because the books often reenforced a lot of the same thoughts from different angles, I've got well formed mental pathways in my head, which help me in all kinds of situations. Same thing happens if you're a regular consumer of mixergy videos.
When faced with a decision, instead of thinking "Peter Drucker said to do this", I think "The right approach is probably... " because that is how my brain is now "wired" to think. It's kind of like self-brain-washing or creating marcos for your brain. You are what you read.