The term "Old Self" is a theological concept found in the New Testament, primarily in the writings of the Apostle Paul. It refers to the pre-conversion state of a person, characterized by sinful nature and behaviors that are contrary to the will of God. The "Old Self" is often contrasted with the "New Self," which represents the transformed life of a believer in Christ.

Biblical References:

1. Romans 6:6 · "We know that our old self was crucified with Him so that the body of sin might be rendered powerless, that we should no longer be slaves to sin." In this passage, Paul explains that the "Old Self" is crucified with Christ, symbolizing the believer's break from the power of sin. This crucifixion is not a physical death but a spiritual transformation that occurs when one accepts Christ as Savior.

2. Ephesians 4:22-24 · "You were taught with regard to your former way of life, to put off your old self, which is being corrupted by its deceitful desires; to be renewed in the spirit of your minds; and to put on the new self, created to be like God in true righteousness and holiness." Here, Paul instructs believers to actively "put off" the old self, indicating a conscious decision to reject past sinful behaviors and attitudes. The renewal of the mind is essential in this transformation, leading to a life that reflects God's righteousness and holiness.

3. Colossians 3:9-10 · "Do not lie to one another, since you have taken off the old self with its practices, and have put on the new self, which is being renewed in knowledge in the image of its Creator." In this context, the "Old Self" is associated with specific sinful practices, such as lying. The "New Self" is described as being continually renewed, emphasizing the ongoing process of sanctification in the believer's life.

Theological Significance:

The concept of the "Old Self" is integral to understanding the doctrine of sanctification. It underscores the radical change that occurs in a person's life upon accepting Christ. The "Old Self" is associated with the fallen nature of humanity, inherited from Adam, which is marked by sin and separation from God. In contrast, the "New Self" is a result of the believer's union with Christ, characterized by a new nature that seeks to live in accordance with God's will.

The transformation from the "Old Self" to the "New Self" is both a definitive act and a progressive journey. It begins at the moment of salvation, where the believer is justified and declared righteous before God. However, the process of sanctification continues throughout the believer's life, as they grow in spiritual maturity and conformity to the image of Christ.

Practical Implications:

Believers are called to actively participate in the process of sanctification by rejecting the behaviors and attitudes of the "Old Self." This involves a daily commitment to live according to the Spirit, as opposed to the flesh. The renewal of the mind through Scripture, prayer, and fellowship with other believers is crucial in this transformation.

The "Old Self" serves as a reminder of the believer's past life and the grace that has been extended through Christ. It highlights the importance of living a life that reflects the transformative power of the Gospel, serving as a testimony to others of the change that Christ can bring.