He also needs to ponder that the spiritual is something completely concrete, something able to completely take hold of each other mutually, while the natural is separated into individual parts and form in and out of itself, no fixed unit. Where it does feature as a whole, it is only because of the inner spiritual. This way you will gain clearer insight into the spiritual sun and the difference between the natural and the spiritual suns will be even more pronounced. – The Spiritual Sun, Book 1, Chapter 1, Paragraph 15