What Is the Soul? A Comparative Look at Judaism, Christianity, and Islam

In the Hebrew Bible, the primary word for soul is nefesh (נֶפֶשׁ), though related terms like neshamah and ruach also appear. The nefesh isn't simply an immortal ghost floating free of the body—it's more holistic than that, encompassing life-force, personality, desire, and one's relational standing before God Psalms 66:9.

The Psalms are especially rich here. The soul longs, faints, rejoices, and breaks with yearning—it's the innermost self in dialogue with the divine Psalms 119:20. Psalm 84:2 captures this beautifully:

My soul longeth, yea, even fainteth for the courts of the LORD: my heart and my flesh crieth out for the living God.

Psalms 84:2 This isn't abstract theology—it's visceral, embodied longing.

Rabbinic tradition, developed extensively in the Talmud and later by medieval thinkers like Maimonides (12th century) and Nachmanides (13th century), elaborated a multi-part soul: nefesh (animating life), ruach (spirit/moral character), and neshamah (the highest divine breath). Nachmanides emphasized the soul's divine origin and its ultimate return to God after death.

Crucially, Judaism has historically resisted sharp body-soul dualism. The soul isn't imprisoned in the body; rather, the two are partners in covenant life. The soul's redemption is treated as extraordinarily precious—something that cannot simply be bought or bargained away Psalms 49:8.

The soul also praises God and depends on divine sustenance to remain alive Psalms 119:175. It can be vexed and troubled Psalms 6:3, reflecting that Jewish thought doesn't sanitize the soul's experience—suffering is real and acknowledged before God.

Christianity inherits the Hebrew concept of nefesh but also absorbs Greek philosophical categories—particularly through the Septuagint's translation of nefesh as psyche (ψυχή). By the New Testament period, the soul is understood as the deepest inner self, capable of salvation or damnation, joy or anguish.

Perhaps the most striking New Testament statement about the soul comes from Jesus himself in Gethsemane. Both Matthew and Mark record him saying:

My soul is exceeding sorrowful, even unto death: tarry ye here, and watch with me.

Matthew 26:38 This is remarkable—the incarnate Son of God attributes to his own soul a grief so profound it borders on death. It anchors the soul firmly in emotional and spiritual reality, not merely metaphysical abstraction Mark 14:34.

Early Church Fathers like Tertullian (c. 155–220 AD) argued the soul is corporeal in some sense, while Origen (c. 184–253 AD) leaned toward a more Platonic, pre-existent soul. Augustine of Hippo (354–430 AD) became the dominant voice, describing the soul as rational, immortal, and made for God—famously writing, 'our heart is restless until it rests in Thee.'

Thomas Aquinas (13th century) synthesized Aristotle and Christian theology, defining the soul as the form of the body—not a separate prisoner inside flesh, but the organizing principle that makes a human being what they are. This remains influential in Catholic theology today.

Protestant reformers like Calvin emphasized the soul's total dependence on God's grace. Contemporary evangelical theologians debate whether the soul is a distinct substance (substance dualism) or whether humans are 'psychosomatic unities' (monism)—a live disagreement in Christian anthropology.

What's consistent across traditions: the soul is precious Psalms 49:8, it can experience joy in God Psalms 35:9, and it's the locus of one's eternal relationship with the divine.

Islam teaches that the soul (ruh, روح) is a divine trust breathed into humanity by God—but it's also one of the most explicitly mysterious concepts in the Qur'an. Surah Al-Isra (17:85) states that the ruh is 'of the command of my Lord, and of knowledge, you have been given only a little.' Islamic scholars have historically taken this as a divine instruction not to over-speculate about the soul's ultimate nature.

That said, Islamic theology does affirm several things clearly. The soul is created by God, distinct from the body, and survives physical death. At death, the angel Azrael receives the soul; it then enters a state called barzakh (an intermediate realm) until the Day of Resurrection. The soul will ultimately face divine judgment.

Ibn Qayyim al-Jawziyyah (14th century) wrote extensively on the soul in Kitab al-Ruh, arguing that the soul is a subtle, self-subsisting entity that inhabits the body but isn't identical to it. Al-Ghazali (11th century) similarly distinguished the ruh from the physical heart while insisting the soul is the true self that knows and loves God.

Islamic anthropology also uses nafs (نفس)—cognate with Hebrew nefesh—which can mean 'self,' 'soul,' or 'psyche.' The Qur'an describes three states of the nafs: the commanding self (nafs al-ammara), the self-reproaching self (nafs al-lawwama), and the tranquil self (nafs al-mutma'inna)—the last being the soul at peace with God, invited into paradise.

There's no direct Qur'anic passage in the retrieved sources, but the concept of the soul's preciousness and its dependence on God for life aligns with what the Psalms express Psalms 66:9—a convergence that reflects the shared Abrahamic root of these traditions.

In the Hebrew Bible, the soul (nefesh) is intimately linked to life, vulnerability, desire, joy, and distress—it’s the living self God actively preserves. “He holds our soul in life,” underscores God’s sustaining care. Psalms 66:9 The nefesh longs for God’s courts, showing deep desire for divine presence. Psalms 84:2 It rejoices in God’s salvation and can be crushed with anguish, capturing the full range of human experience before God. Psalms 35:9Psalms 6:3 The soul is also portrayed as the living subject that praises God: “Let my soul live, and it shall praise thee,” tying life to worship. Psalms 119:175 Finally, redemption of the soul is called “precious,” highlighting its inestimable value. Psalms 49:8 These texts together present the soul not as an abstract substance isolated from embodiment, but as the life-bearing, responsive self engaged with God’s judgments and grace. Psalms 119:20Psalms 119:175

In the New Testament, the soul (psyche) likewise denotes the inner life and self that encounters God. Jesus says, “My soul is exceeding sorrowful, even unto death,” revealing the soul as the seat of profound anguish amid obedience to the Father. Matthew 26:38 The parallel in Mark repeats the emphasis, showing continuity with Israel’s Scriptures where the soul can be vexed, long, rejoice, and praise. Mark 14:34Psalms 6:3Psalms 35:9 Christian readers often read the Psalms as their prayer book, so the psalmic language that the soul lives, longs, and praises remains central to Christian piety. Psalms 119:175Psalms 84:2 Within these cited texts, the soul is the living, responsive self turned Godward—capable of deep sorrow yet ordered toward salvation and praise. Matthew 26:38Psalms 35:9

Due to the absence of retrieved Islamic scripture or classical sources in this set, I can’t make a sourced statement about Islam’s view of the soul here without overreaching; providing unsourced claims wouldn’t be responsible.