Spirit of God One of 3 Independent Principles — William Clayton (May 16, 1841)
There are three independent principles — the spirit of God, the spirit of man, and the spirit of the devil. All men have power to resist the devil. They who have tabernacles have power over those who have not.
Discourse, 16 May 1841, as Reported by William Clayton, p. 9, The Joseph Smith Papers.