The concept of rejecting the old nature is a fundamental theme in Christian theology, emphasizing the transformation that occurs in a believer's life through faith in Jesus Christ. This transformation involves a decisive break from the sinful nature inherited from Adam, often referred to as the "old self" or "old man," and the adoption of a new nature in Christ.

Biblical Foundation

The Apostle Paul addresses the concept of rejecting the old nature extensively in his epistles. In Ephesians 4:22-24 , Paul instructs believers: "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." This passage highlights the active role believers must take in discarding their former sinful behaviors and attitudes.

Similarly, in Colossians 3:9-10 , Paul writes, "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." Here, the emphasis is on the continuous renewal and transformation into the likeness of Christ.

Theological Implications

Rejecting the old nature is not merely a one-time event but an ongoing process of sanctification. This process is empowered by the Holy Spirit, who indwells believers and enables them to overcome the desires of the flesh. Galatians 5:16-17 states, "So I say, walk by the Spirit, and you will not gratify the desires of the flesh. For the flesh craves what is contrary to the Spirit, and the Spirit what is contrary to the flesh."

The old nature is characterized by sin and separation from God, as described in 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." Through Christ's death and resurrection, believers are set free from the bondage of sin and are called to live in the freedom of the Spirit.

Practical Application

Rejecting the old nature requires intentionality and discipline. Believers are encouraged to engage in spiritual practices such as prayer, Bible study, and fellowship with other Christians to strengthen their new nature. Romans 12:2 exhorts, "Do not be conformed to this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what is the good, pleasing, and perfect will of God."

Furthermore, the rejection of the old nature involves a conscious decision to turn away from sinful habits and to cultivate virtues that reflect the character of Christ. This is a daily commitment to live out the reality of being a new creation, as stated in 2 Corinthians 5:17 : "Therefore if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come!"

Challenges and Encouragement

While the journey of rejecting the old nature can be challenging, believers are assured of God's grace and strength. Philippians 1:6 offers encouragement: "Being confident of this, that He who began a good work in you will carry it on to completion until the day of Christ Jesus." This promise assures believers that God is actively working in their lives to bring about the fullness of their transformation.

In summary, rejecting the old nature is a vital aspect of the Christian life, requiring believers to actively participate in their spiritual growth and transformation. Through the power of the Holy Spirit and the guidance of Scripture, believers are equipped to live in the newness of life that Christ offers.