Omniscience

“Great is our Lord, and abundant in power; his understanding is beyond measure.” — Psalm 147:5

God’s omniscience is His perfect, complete, and exhaustive knowledge of all things — past, present, and future. Nothing is hidden from His sight, and His understanding has no limit. The Hebrew tevunah (תְּבוּנָה) — “understanding, insight” — used in Psalm 147:5 is said to be literally “without number” (ein mispar, אֵין מִסְפָּר), a declaration that God’s comprehension is not merely vast but infinite.

What God Knows

• All events — past, present, and future (Isaiah 46:9–10)
• All thoughts — the inner life of every person (Psalm 139:1–4)
• All possibilities — what would have happened under different circumstances (1 Samuel 23:11–12; Matthew 11:21)

“O LORD, you have searched me and known me! You know when I sit down and when I rise up; you discern my thoughts from afar.” — Psalm 139:1–2

The Nature of Divine Knowledge

God’s knowledge is not acquired through learning or investigation. Unlike human beings who move from ignorance to understanding, God has always known all things perfectly and simultaneously. The Hebrew word da’at (דַּעַת) refers to knowledge, but when applied to God it denotes an intimate, immediate awareness that encompasses all reality at once.

The Greek word prognōsis (πρόγνωσις) — “foreknowledge” — appears in the New Testament (Acts 2:23; 1 Peter 1:2) to describe God’s advance knowledge of events and persons. The relationship between God’s foreknowledge and His sovereign decree has been understood differently across Christian traditions. Reformed theology, following Augustine and Calvin, holds that God’s foreknowledge is not merely passive foresight but is grounded in His eternal decree — He foreknows because He foreordains (cf. Romans 8:29–30; Ephesians 1:11). The Arminian tradition, following Arminius and Wesley, affirms God’s exhaustive foreknowledge but distinguishes it from causation — God perfectly foresees the free choices of His creatures without thereby determining them. The Molinist tradition, developed by the Jesuit Luis de Molina (1535–1600), proposes that God possesses “middle knowledge” (scientia media) — knowledge of what every free creature would do in any possible set of circumstances (cf. 1 Samuel 23:11–12; Matthew 11:21) — and that He uses this knowledge to providentially govern the world while preserving genuine creaturely freedom.

“Remember the former things of old; for I am God, and there is no other; I am God, and there is none like me, declaring the end from the beginning and from ancient times things not yet done.” — Isaiah 46:9–10

God’s Knowledge of Himself

The deepest dimension of divine omniscience is God’s perfect knowledge of Himself. The apostle Paul writes, “For who knows a person’s thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God” (1 Corinthians 2:11). The Father, Son, and Spirit share an exhaustive mutual knowledge — epiginōskō (ἐπιγινώσκω) — “to know fully, to recognize completely” — that is the foundation of the Trinitarian life. Jesus declared, “No one knows the Son except the Father, and no one knows the Father except the Son and anyone to whom the Son chooses to reveal him” (Matthew 11:27). This mutual self-knowledge within the Godhead is not merely cognitive but relational and loving — a communion of persons who know one another exhaustively from all eternity (John 10:15; 17:25).

Omniscience and Wisdom

Scripture distinguishes between knowledge and wisdom. God possesses not only complete knowledge (da’at) but also perfect wisdom — chokmah (חָכְמָה) — the skill to apply knowledge rightly. His decisions are never uninformed, never shortsighted, never in need of correction:

“Oh, the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways!” — Romans 11:33

God’s wisdom is displayed supremely in the plan of salvation, which Paul describes as “a secret and hidden wisdom of God” (1 Corinthians 2:7). What appeared to human eyes as the foolishness of a crucified Messiah was in truth the most brilliant act of divine wisdom ever revealed (1 Corinthians 1:24–25). The wisdom literature of the Old Testament celebrates this divine chokmah as present with God before creation itself (Proverbs 8:22–31), a theme the Church Fathers connected to the eternal Logos through whom all things were made (John 1:3; Colossians 1:16).

Comfort and Accountability

God’s omniscience brings both comfort and sobriety. It is comforting because He knows our struggles and needs before we speak (Matthew 6:8; cf. Psalm 139:4). The God who knows us exhaustively still loves us unfailingly — this is the marvel of grace. It brings accountability because nothing is hidden — every deed and motive stands exposed before Him: “No creature is hidden from his sight, but all are naked and exposed to the eyes of him to whom we must give account” (Hebrews 4:13).

For the believer, God’s exhaustive knowledge is a source of profound assurance. He who knows the number of hairs on our heads (Matthew 10:30) and collects our tears in His bottle (Psalm 56:8) governs all things with perfect awareness and fatherly care. No suffering goes unnoticed; no prayer falls on deaf ears. As Augustine wrote, God does not need our prayers to know our needs, yet He bids us pray so that we might open our hearts to receive what He has already purposed to give.

“For the eyes of the LORD run to and fro throughout the whole earth, to give strong support to those whose heart is blameless toward him.” — 2 Chronicles 16:9

For those who reject God, however, His omniscience is fearful. There is no hiding place from the all-seeing God (Psalm 139:7–12; Proverbs 15:3). On the last day, every secret thought and hidden deed will be brought into the light (Ecclesiastes 12:14; Romans 2:16). Yet even this fearful knowledge serves a redemptive purpose — it strips away self-deception and calls sinners to repentance before the God from whom nothing is concealed.

“Search me, O God, and know my heart! Try me and know my thoughts! And see if there be any grievous way in me, and lead me in the way everlasting!” — Psalm 139:23–24