Likewise with the existence of Spirit: we cannot theoretically or verbally or philosophically or rationally or mentally describe the answer in any other ultimately satisfactory fashion except to say: engage the injunction. If you want to know this, you must do this. Any other approach and we would be trying to use the eye of mind to see or state that which can be seen only with the eye of contemplation, and thus we would have nothing but metaphysics in the very worst sense – statements without evidence.