in it, this masterful quote from C.S. Lewis (who i think Keller really likes for his apologetics):
If what you want is an argument against Christianity... you can easily find some stupid and unsatisfactory Christian and say ... "So there's your boasted new man! Give me the old kind." But if once you have begun to see that Christianity is on other grounds probable, you will know in your heart that this is only evading the issue. What can you ever really know of other people's souls - of their temptations, their opportunities, their struggles? One soul in the whole creation you do know: and it is the only one whose fate is placed in your hands.
If there is a God, you are, in a sense, alone with Him.
You cannot put Him off with speculations about your next-door neighbours or memories of what you have read in books. What will all that chatter and hearsay count when the anaesthetic fog we call "nature" or "the real world" fades away and the Divine Presence in which you have always stood becomes palpable, immediate, and unavoidable?
this is from Lewis' Mere Christianity (Macmillan: 1965 p168), which (so it was sold to me) is what Tim Keller is trying to perhaps not emulate in the Reason for God, but retell, from his own perspective; to set out clearly, and carefully, just what it is that makes Christianity not stupid, but reasonable, and sensible.
i think Keller wants the non-Christian to pick up this book and say firstly, 'that's a stupid title - as if there's a reason for God'. then he wants their Christian friend to say, 'why's it stupid?' and then whatever their answer, be able to say, 'no, he talks about that too - he's thought about that, we - Christians - HAVE thought about that. you're not the first or the only one to ask that. read his answer. than come back to me'. or something like that.
if you're reading, Mick, i'll have that review out for you soon!