If you question everything thoroughly enough, the truth will eventually hit you upside the head and you will KNOW. But here's a warning: It won't be what you imagined. It won't even come close.
This is not the same old crap you've seen in a thousand books you don't want to read. This is Zen for people who don't give a rat's ass about Zen. This is the real deal.
'You need to read this book.' -Bill Stevenson