is a term used to denote that there is but one God or self-existent being. The unity of God is argued from his self-existence, his independence, the perfection of his nature, his omnipotence, and the unity of design in the works of nature. The doctrine was lost sight of by heathens, and maintained by Israel and in the Gospel. The: Scriptures make no attempt to prove the doctrine, but assert it unequivocally. See Exodus 20:3; Deuteronomy 4:35; Deuteronomy 6:4; Psalms 86:10; 1 Corinthians 8:4; 1 Corinthians 8:6, etc. When the doctrine of the Trinity (q.v.) was formulated, it became necessary for the Church to declare that this does not conflict with the doctrine of his unity. See Hagenbach, Hist. of Doct. 1, 102, 330; Van Oosterzee, Christian Dogmatics, 1, 250.