Efésios 4:6

One God and Father of all, who is over all, and through all, and in all.

The seventh of these great unities is God himself. The Pauline teaching that all people "live and move and have their being in God" is implicit in a verse like this. The very fact of the existence of life proves that God is.

One God ... The unity of God, as reiterated in the first commandment of the Decalogue, was thus emphasized at a time when the world was steeped in polytheism. This great truth burst upon the pagan darkness of pre-Christian times like sheet lightning at midnight (Deuteronomy 6:4). "The Lord our God is one Lord!" The Old Testament, however, does not deny the New Testament conception of the Godhead as a plurality. The word for God's oneness in the Old Testament is [~'echad], the same being a compound unity (as in "The people is one" - Genesis 11:6). Therefore, Deuteronomy 6:4, and similar passages, may not be alleged as a denial of that plurality associated with deity in the New Testament.