Divine simplicity teaches that God is not composed of parts — his being, attributes, and will are identical with himself. This is not a philosophical imposition but grows from the biblical insistence that God is the absolute, self-existent one with no needs, no dependencies, and no internal divisions. Scripture does not say "God has love as a property" but "God is love" (1 John 4:8). Similarly: God is light (1 John 1:5), God is spirit (John 4:24), and the divine name is the great "I AM" (Exodus 3:14) — pure self-existent being. Divine simplicity guards against: (1) thinking God's attributes could conflict with each other (mercy vs. justice); (2) thinking God is dependent on anything external for his perfection; (3) picturing God as assembled from qualities rather than as the source of them. It is one of the most challenging but foundational doctrines of classical theism.
• 1 John 4:8 — "God is love." — Not "has love" but IS love — identity, not attribute possession.
• 1 John 1:5 — "God is light, and in him is no darkness at all." — Absolute undivided moral purity.
• Exodus 3:14 — "I AM WHO I AM." — Self-existence, pure being, no external dependencies.
• Deuteronomy 6:4 — "The LORD our God, the LORD is one." — Divine unity and undivided being.
• John 4:24 — "God is spirit" — not "has a spirit"; his nature IS spirit, undivided and non-material.
PROBLEM SIMPLICITY SOLVES:
If God has parts, something is prior to or greater than God
(the cause of his composition). But God is uncaused, ultimate.
Therefore he cannot be composed of parts he didn't cause.
WHAT THIS MEANS PRACTICALLY:
• God's love and wrath don't conflict — they're one divine response
to sin, viewed from different angles by finite creatures.
• God doesn't have a "side" that is merciful and a "side" that is just —
the cross is where we see both simultaneously as one act.
• God's will, mind, and being are identical — he doesn't "decide"
things externally; his decree flows from who he eternally is.
• We cannot reduce God to any one attribute (love, wrath, mercy) —
any single attribute abstracted from the whole is an idol.
ANALOGY (limited):
The sun does not "have" warmth, light, and radiation as three separate
components. They are all one undivided reality of what the sun IS —
the divisions are in the experience of the observer, not in the sun.
God is infinitely more unified than even this.
Philosophical roots: Aristotle's "Unmoved Mover" — pure actuality,
no potentiality, no composition.
Patristic appropriation:
Augustine (De Trinitate): God's goodness = his wisdom = his power
Anselm: God is "that than which nothing greater can be conceived" —
implies no external dependencies or composition
Aquinas (Summa Theologica Ia, Q.3): The most systematic treatment;
five arguments for divine simplicity.
Protestant affirmation:
Westminster Confession (1647): God is "most pure spirit,
without body, parts, or passions"
London Baptist Confession (1689): Same language
Modern challenge:
Social Trinitarianism and Open Theism tend to reject simplicity
(Alvin Plantinga argued God has distinct properties)
Classical theism defenders:
James Dolezal (All That Is in God, 2017) — the key modern retrieval