"An outer light, fair as the sun..."

G.K. Chesterton, Orthodoxy, Chapter 5:

Of all horrible religions the most horrible is the worship of the god within. Anyone who knows anybody knows how it would work; anyone who knows anyone from the Higher Thought Centre knows how it does work. That Jones shall worship the god within him turns out ultimately to mean that Jones shall worship Jones. .... Christianity came into the world firstly in order to assert with violence that a man had not only to look inwards, but to look outwards, to behold with astonishment and enthusiasm a divine company and a divine captain. The only fun of being a Christian was that a man was not left alone with the Inner Light, but definitely recognised an outer light, fair as the sun, clear as the moon, terrible as an army with banners.