If there is anything that can make our comprehension clear, it is reason on one side and feeling on the other. A man in whom feeling is not awakened is awake and asleep at the same time. That which is living is not reason, it is feeling. Many think when the brain is working it is something tangible; one does not notice it working in feeling. But in reality feeling takes the part of the engineer and the brain is like the mechanism. The mechanism cannot work without the engineer; so the brain cannot work without the feeling behind it. These two things are needed to make knowledge clear.