Simplicity
all composition implies imperfection, dependency, and divisibility, we may not think of God as being composite even in the remotest sense of the word. Thus, we acknowledge God in every respect to be perfect and of singular essence.
Wilhelmus à Brakel, The Christian's Reasonable Service, ed. Joel R. Beeke, trans. Bartel Elshout, vol. 1 (Grand Rapids, MI: Reformation Heritage Books, 1992), 96.