Outliers by Malcolm Gladwell. The lesson on the surface is that you need to practice/work to become good at anything, but the deeper message for me was that everything is basically preordained. People are acting based on what's logical to them, which is the sum of their experiences. Since we can't control what happens to us, we aren't really in control of what we do either. I mean, the future is still wide open, but looking back, everything happens for a reason, and those reasons are pretty much out of our control. I'm not entirely certain that was the message Gladwell was trying to portray, but that's how I've viewed life ever since I read that book.