Rodney Collin (April 26, 1909–May 3, 1956) was a British writer in the area of spiritual development. His work was heavily influenced by his teacher, P. D. Ouspensky, and through him, G. I. Gurdjieff – both key proponents of the Fourth Way teaching in the twentieth century. Collin’s output includes his magnum opus Theory of Celestial Influence as well as The Mirror of Light, Theory of Conscious Harmony and Theory of Eternal Life.

“Esoteric knowledge is knowledge of the whole, ordinary knowledge is single ideas about a part taken separately.”