Man, Natural
What Is the Natural Man?
The concept of the "natural man" comes from the apostle Paul's first letter to the Corinthians: "The natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned" (1 Corinthians 2:14). The Greek word translated "natural" refers to the soul-life — the person governed by merely human capacities, instincts, and reasoning, apart from the illuminating work of the Holy Spirit.
This is not a statement about intelligence or morality in the ordinary sense. A natural person may be highly educated, culturally refined, and outwardly virtuous. Paul's point is that spiritual realities — the wisdom of God revealed through Christ crucified — remain fundamentally inaccessible to human faculties unaided by the Spirit. The cross appears as "foolishness" to natural wisdom (1 Corinthians 1:18), yet it is the very power of God for salvation.
Paul's Fourfold Description of Humanity
Paul uses four contrasting pairs of adjectives to describe humanity before and after conversion, each illuminating a different dimension of the transformation:
The old man and the new man (Romans 6:6; Ephesians 4:22-24; Colossians 3:9-10) presents the change chronologically. The old man is who we were before regeneration, described as "corrupt" and enslaved to sin. The new man is created "in righteousness and true holiness," bearing the image of God.
The outward man and the inward man (2 Corinthians 4:16; Romans 7:22; Ephesians 3:16) distinguishes between the visible, decaying body and the inner person being renewed day by day. Even as the body wastes away, the Spirit strengthens the believer's inner life.
The carnal man and the spiritual man (Romans 8:1-14; 1 Corinthians 3:1-4) describes the governing principle of a person's life. The carnal or fleshly person lives according to the desires of fallen human nature, while the spiritual person walks according to the Spirit.
The natural man and the spiritual man (1 Corinthians 2:14-15; 15:46; Ephesians 2:3) contrasts the person limited to natural human perception with the person who has received the Spirit and can therefore discern spiritual truth.
The Condition of the Natural Man
Paul paints a sobering portrait of the natural condition. Humanity apart from grace is described as "dead in trespasses and sins" (Ephesians 2:1), following the course of the world and the desires of the flesh (Ephesians 2:2-3). The mind set on the flesh is "hostile to God" and "does not submit to God's law; indeed, it cannot" (Romans 8:7).
This does not mean that unregenerate people are incapable of any good. Paul acknowledges that Gentiles who do not have the law sometimes "do by nature things required by the law" because its requirements are "written on their hearts" (Romans 2:14-15). General revelation and the conscience provide a measure of moral awareness. But in the crucial matter of receiving God's saving wisdom and responding to the gospel in faith, the natural person is helpless without divine intervention.
The root problem is not merely ignorance but a fundamental misalignment of the will and affections. Sin has corrupted not just behavior but the very faculties of perception and desire, so that what is most glorious — the glory of God in the face of Christ — appears foolish or irrelevant to the natural mind.
The Necessity of Spiritual Rebirth
Because the natural condition is one of spiritual inability, Scripture consistently teaches the necessity of a transforming work by God's Spirit. Jesus told Nicodemus, "Unless one is born again, he cannot see the kingdom of God" (John 3:3). This new birth is not something humans can accomplish for themselves; it is a sovereign act of God who "made us alive together with Christ" even "when we were dead in our trespasses" (Ephesians 2:5).
Paul describes this transformation using vivid imagery. The old man must be "crucified" so that the body of sin might be destroyed (Romans 6:6). Believers are to "put off" the old self like filthy garments and "put on" the new self, created after the likeness of God (Ephesians 4:22-24; Colossians 3:9-10). This is not mere self-improvement but a radical re-creation: "If anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come" (2 Corinthians 5:17).
Living by the Spirit
The contrast between natural and spiritual has practical implications for daily life. Those who have received the Spirit are called to "walk by the Spirit" and not gratify the desires of the flesh (Galatians 5:16). The spiritual person is able to discern all things (1 Corinthians 2:15), not claiming omniscience but possessing a Spirit-given capacity to evaluate life from God's perspective.
Paul warns that even believers can behave as "carnal" or "fleshly" people when they yield to jealousy and strife rather than living by the Spirit (1 Corinthians 3:1-3). The distinction between natural and spiritual is therefore not simply a one-time status change but an ongoing reality that calls for continual dependence on the Holy Spirit, renewal of the mind (Romans 12:2), and growth in conformity to Christ.
Biblical Context
The concept appears most explicitly in 1 Corinthians 2:14 but is woven throughout Paul's writings. Romans 6-8 develops the contrast between the old and new life, flesh and Spirit. Ephesians 2:1-10 describes the transition from spiritual death to life. Colossians 3:1-17 outlines the practical outworking of putting off the old and putting on the new. Jesus' teaching on the new birth in John 3:1-8 provides the Gospel foundation for Paul's theology.
Theological Significance
The doctrine of the natural man establishes the necessity of grace for salvation. If humans could perceive and receive spiritual truth by their own faculties, the work of the Holy Spirit would be unnecessary. This teaching undergirds the Reformation principle of salvation by grace alone through faith alone. It also explains why the gospel often meets with incomprehension or hostility — not because the message is irrational, but because fallen human nature is predisposed against the wisdom of God. At the same time, the promise of spiritual transformation offers profound hope: what is impossible for the natural man becomes reality through the renewing power of the Spirit.
Historical Background
Paul's language reflects the broader Greco-Roman philosophical context in which distinctions between soul and spirit, body and mind, were actively debated. The Stoics taught that the rational soul could achieve virtue through discipline. Platonic thought distinguished between the material and immaterial aspects of human nature. Paul engages these categories but transforms them, insisting that the fundamental human problem is not ignorance curable by education but spiritual death requiring divine resurrection. Early church fathers like Augustine developed Paul's teaching into the doctrine of original sin, which profoundly shaped Western theology's understanding of human nature and the necessity of grace.