Definition and Overview:
Active participation in sanctification refers to the believer's role in the process of becoming more like Christ, a journey that involves both divine initiative and human response. Sanctification is the work of the Holy Spirit in a believer's life, setting them apart for God's purposes and transforming them into the image of Christ. While God is the primary agent of sanctification, believers are called to actively engage in this process through obedience, spiritual disciplines, and moral effort.

Biblical Foundation:
The concept of sanctification is deeply rooted in Scripture, emphasizing both God's role and the believer's responsibility. Philippians 2:12-13 captures this dual aspect: "Therefore, my beloved, just as you have always obeyed—not only in my presence but now even more in my absence—continue to work out your salvation with fear and trembling. For it is God who works in you to will and to act on behalf of His good purpose."

Divine Initiative:
Sanctification begins with God's work in the believer. It is God who initiates and empowers the process. 1 Thessalonians 5:23 states, "Now may the God of peace Himself sanctify you completely, and may your entire spirit, soul, and body be kept blameless at the coming of our Lord Jesus Christ." This verse underscores that sanctification is ultimately a divine act, ensuring that believers are set apart for God's glory.

Human Responsibility:
While God is the source of sanctification, believers are called to actively participate. This involves a conscious effort to align one's life with God's will. Romans 12:1-2 exhorts believers: "Therefore I urge you, brothers, on account of God’s mercy, to offer your bodies as living sacrifices, holy and pleasing to God, which is your spiritual service of worship. Do not be conformed to this world, but be transformed by the renewing of your mind." Here, the call to present oneself as a living sacrifice and to renew the mind highlights the active role believers must play.

Spiritual Disciplines:
Active participation in sanctification often involves engaging in spiritual disciplines such as prayer, Bible study, worship, and fellowship. These practices help believers grow in their faith and become more attuned to the Holy Spirit's work in their lives. Ephesians 6:18 encourages believers to "pray in the Spirit at all times, with every kind of prayer and petition," emphasizing the importance of prayer in the sanctification process.

Moral Effort and Obedience:
Believers are also called to exert moral effort and live in obedience to God's commands. 1 Peter 1:14-16 instructs, "As obedient children, do not conform to the passions of your former ignorance. But just as He who called you is holy, so be holy in all you do, for it is written: 'Be holy, because I am holy.'" This passage highlights the necessity of moral effort and the pursuit of holiness as part of active participation in sanctification.

The Role of Community:
The Christian community plays a vital role in the sanctification process. Believers are encouraged to support and exhort one another in their spiritual growth. Hebrews 10:24-25 states, "And let us consider how to spur one another on to love and good deeds. Let us not neglect meeting together, as some have made a habit, but let us encourage one another, and all the more as you see the Day approaching." Community provides accountability, encouragement, and opportunities for growth.

Conclusion:
Active participation in sanctification is a dynamic interplay between divine grace and human effort. While God initiates and sustains the process, believers are called to respond with obedience, engage in spiritual disciplines, and pursue holiness in community with other believers. Through this cooperative effort, believers are progressively transformed into the likeness of Christ, reflecting His character and glory in their lives.