There’s a saying that goes like this: The unexamined life is not worth living. Socrates, right? As often as that idea gets batted around, though, the big questions about life — why are we here? what really matters? — seem mainly to go ignored. That’s what the preeminent social critic Os Guinness writes about in his newest book. Which highlights another interesting phenomenon: Searching for answers to the deepest questions almost always centers around reading and, yep, writing.