What is God's Omniscience?

Understanding Psalm 147:5

Omniscience — from the Latin omni (all) and scientia (knowledge) — is the divine attribute affirming that God knows everything. His knowledge is perfect, complete, and eternal. He does not learn, forget, or discover. All reality — actual and possible, past, present, and future — is fully known to God.

Biblical foundations

Psalm 147:5: 'Great is our Lord and mighty in power; his understanding has no limit.'

Psalm 139:1-4: 'You have searched me, Lord, and you know me. You know when I sit and when I rise; you perceive my thoughts from afar. You discern my going out and my lying down; you are familiar with all my ways. Before a word is on my tongue you, Lord, know it completely.'

1 John 3:20: 'God is greater than our hearts, and he knows everything.'

Hebrews 4:13: 'Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account.'

Isaiah 46:10: 'I make known the end from the beginning, from ancient times, what is still to come.'

Scope of God's knowledge

All facts: Every event, entity, and state of affairs in the universe is known to God (Matthew 10:29 — 'not one sparrow falls to the ground outside your Father's care').

All thoughts: God knows human minds exhaustively (1 Chronicles 28:9 — 'the Lord searches every heart and understands every desire and every thought').

All possibilities: God knows what would happen under conditions that never occur. Theologians call this 'middle knowledge' — what would happen if. Jesus demonstrates this in Matthew 11:21: 'If the miracles that were performed in you had been performed in Tyre and Sidon, they would have repented long ago.'

The future: God knows future events exhaustively. Prophecy depends on this — God announces what will happen because He already knows it (Isaiah 46:10).

Theological implications

Foreknowledge and free will: The relationship between God's exhaustive knowledge of the future and human freedom has generated extensive theological debate. The mainstream position across Catholic, Reformed, and Orthodox traditions is compatibilism: God knows what free agents will choose without causing those choices. Knowledge of an event does not cause the event — just as knowing the sun will rise tomorrow does not cause it to rise.

Open theism — a minority position — argues that God voluntarily limits His knowledge of future free choices, knowing them as possibilities rather than certainties. Most evangelical and Catholic theologians reject this as incompatible with classical theism and prophetic fulfillment.

Providence: Because God knows all things, His governance of history is not reactive but purposeful. Romans 8:28 — 'in all things God works for the good' — depends on omniscience.

Prayer: Omniscience does not make prayer unnecessary. Jesus said, 'Your Father knows what you need before you ask him' (Matthew 6:8) — then immediately taught the Lord's Prayer. Prayer is relational, not informational.

Pastoral significance

Omniscience provides comfort: God knows your suffering, even when you cannot articulate it (Psalm 56:8 — 'you have collected all my tears in your bottle'). It provides accountability: nothing is hidden, so integrity matters in secret as in public. It provides security: God's plans cannot be surprised or derailed by unforeseen events.

Omniscience means you are fully known — and in Christ, fully known and fully loved.