We are responsible for what we are, and whatever we wish ourselves to be, we have the power to make ourselves. If what we are now has been the result of our own past actions, it certainly follows that whatever we wish to be in future can be produced by our present actions; so we have to know how to act.
Was there ever a more horrible blasphemy than the statement that all the knowledge of God is confined to this or that book?
You have to grow from the inside out. None can teach you, none can make you spiritual. There is no other teacher but your own soul.