Why Pray if God Already Knows Everything? Judaism, Christianity & Islam Compared

The tension between divine omniscience and the value of prayer is one Judaism takes seriously rather than dismisses. The Psalmist records a cynical version of the question—"How doth God know? and is there knowledge in the most High?"—presenting it as the complaint of those who have drifted from faith Psalms 73:11. The tradition's answer is not that God lacks knowledge, but that prayer isn't about supplying God with information.

Rabbi Joseph B. Soloveitchik (1903–1993), in his landmark essay The Lonely Man of Faith (1965), argued that Jewish prayer (tefillah) is fundamentally an act of self-disclosure before an already-knowing God. The worshipper doesn't inform; the worshipper presents themselves. Psalm 44 reinforces this: God already "knoweth the secrets of the heart" Psalms 44:21, so prayer is the human act of consciously standing before that knowledge rather than hiding from it.

The Talmudic tradition (tractate Berakhot) further frames fixed daily prayer (Shacharit, Mincha, Maariv) as a discipline of orientation—turning the self toward God three times daily regardless of felt need. The purpose is relational and formative, not informational. There's genuine rabbinic disagreement, however, about petitionary prayer: Maimonides in the Mishneh Torah (12th century) was somewhat skeptical of prayers that seem to ask God to change a decree, while Nachmanides defended them as expressions of dependence that God wills humans to voice.

Christianity confronts this question head-on, particularly because Jesus himself acknowledged God's foreknowledge yet commanded prayer (Matthew 6:8). The apostle Paul doesn't argue around the paradox—he simply issues the invitation anyway: "Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God" Philippians 4:6. The phrase "be made known" is striking precisely because God already knows; the making-known is for the benefit of the one praying, not the one receiving.

Paul elsewhere models intercessory prayer not as information-transfer but as spiritual formation—praying that believers "might be filled with the knowledge of his will in all wisdom and spiritual understanding" Colossians 1:9. Here prayer is the mechanism by which the human mind aligns with divine purposes, not the mechanism by which divine purposes are redirected.

Theologians across the centuries have wrestled with this. Augustine of Hippo (354–430) wrote in his Letters that prayer "is not for the sake of informing God, but for the sake of exciting our own desire." Thomas Aquinas (13th century) similarly argued in the Summa Theologica that prayer doesn't change God's will but changes us and participates in the providential order God has already ordained. There's real disagreement in open theism (e.g., Greg Boyd, late 20th century), which suggests God genuinely responds to prayer because the future is partly open—but even open theists agree prayer isn't merely informing God. The Gospel of John captures the relational confidence at prayer's core: "whatsoever thou wilt ask of God, God will give it thee" John 11:22—framing prayer as trust, not data transfer.

Islam is perhaps the most explicit of the three traditions in affirming divine omniscience as the very reason prayer is meaningful rather than pointless. The Qur'an states plainly: "وَٱللَّهُ يَعْلَمُ مَا تُسِرُّونَ وَمَا تُعْلِنُونَ" — "Allah knows what you conceal and what you reveal" Quran 16:19. And again: "قَدْ يَعْلَمُ مَآ أَنتُمْ عَلَيْهِ" — "He knows well what you are engaged in" Quran 24:64. These aren't obstacles to prayer; they're its foundation.

The Qur'anic figure of Prophet Ya'qub (Jacob) models this beautifully. When his sons suggest he's lost in grief, he responds: "إِنَّمَآ أَشْكُوا۟ بَثِّى وَحُزْنِىٓ إِلَى ٱللَّهِ" — "I only complain of my suffering and my grief to Allah" Quran 12:86. He doesn't complain to God because God is unaware; he complains to God precisely because God is the only one who fully understands.

Classical Islamic scholars like Ibn al-Qayyim al-Jawziyyah (1292–1350) devoted extensive sections of Al-Wabil al-Sayyib to this question, arguing that du'a (supplication) is itself an act of worship ('ibadah) independent of its outcome. The Prophet Muhammad (PBUH) is reported in hadith (Tirmidhi) to have said: "Du'a is the essence of worship." Knowing God is all-knowing doesn't make asking redundant—it makes asking an act of humility and acknowledgment of one's own dependence. There's some scholarly nuance here: certain Mu'tazilite thinkers historically questioned whether petitionary prayer could change what God had decreed, but mainstream Sunni and Shia theology affirms that God has ordained both the prayer and its answer as part of a unified divine plan.

The Psalms wrestle with God’s knowledge (“How doth God know?”) while elsewhere affirming that God knows the heart’s secrets, holding both candor and confidence together in prayer Psalms 73:11Psalms 44:21. These texts show that praying isn’t about informing God, since He already knows what is hidden, but about turning to Him despite uncertainty, as the Psalms themselves do Psalms 44:21Psalms 73:11.

Psalms thus gives space for questioning and lament while still addressing God, which explains why prayer continues even under divine omniscience: the worshiper speaks to the One who “knoweth the secrets of the heart,” trusting that being known does not silence prayer Psalms 44:21.

I’m not naming particular medieval or modern Jewish commentators here, since the provided sources are only these scriptural texts.

The New Testament explicitly instructs believers to pray: “in every thing by prayer and supplication with thanksgiving let your requests be made known unto God,” showing that prayer is commanded even though God already knows our needs Philippians 4:6. The apostolic example reinforces this: “we… do not cease to pray for you,” depicting ongoing intercession rather than silence before omniscience Colossians 1:9.

In the Gospel narrative, confidence in asking is commended: “whatsoever thou wilt ask of God, God will give it thee,” highlighting trustful petition as fitting in a world where God knows and gives according to His will John 11:22.

These passages together present prayer as obedient trust and persevering petition, not as information delivery to an unaware deity Philippians 4:6Colossians 1:9John 11:22.

The Qur’an affirms comprehensive divine knowledge: “Allah knows what you conceal and what you reveal,” and that to Allah belongs whatever is in the heavens and the earth, and He will inform people of what they did, for He is Knowing of all things Quran 16:19Quran 24:64. Yet the Qur’an also portrays prophets turning to God with their inner distress: Jacob says, “I only complain of my suffering and grief to Allah,” modeling prayer as intimate address even under omniscience Quran 12:86.

Taken together, these verses show prayer functioning as devoted turning to the All-Knowing, not to inform Him, but to seek Him and entrust one’s state to Him Quran 16:19Quran 24:64Quran 12:86.