People who study the path clearly know there is such a thing; why do they fail to get the message, and go on doubting? It is because their faith is not complete enough and their doubt is not deep enough. Only with depth and completeness, be it faith or doubt, is it really Zen; if you are incapable of introspection like this, you will eventually get lost in confusion and lose the thread, wearing out and stumbling halfway along the road. But if you can look into yourself, there is no one else.
I love this conversation!