The new man, as described by the apostle Paul, emerges through a transformative process akin to receiving a new heart. This renewal signifies a departure from the old life of sin, as the new man is a new creation, renewed in mind and conduct. With a circumcised heart, the new man embodies the essence of the New Covenant, marked by a new heart and a new spirit within him, God's Holy Spirit, enabling him to walk in God's ways. This new heart parallels the renewed mind, reflecting a deep internal change. The creation of this new heart is a collaborative effort between God and man. God initiates by giving a new heart and placing a new spirit within, yet the responsibility also falls on man to make himself a new heart through his actions, by keeping God's law and doing His commandments. This partnership is evident as God commands us to circumcise the foreskin of our heart, while also promising to perform this circumcision Himself. Together, through ongoing cooperation, the new man grows and matures as he walks the Christian way of life. Paul employs the metaphor of putting on clothes to describe adopting the new man, emphasizing the daily choice to embrace this way of life. Just as one chooses what to wear, the new man must be chosen repeatedly, becoming so integral that one refuses to abandon it. This consistent analogy underscores the active, ongoing responsibility to nurture the new man, highlighting that it is not a one-time event but a continual process of renewal and commitment.

In this world filled with challenges, one of the most perilous threats comes from within us: our heart. God is striving to give us a new heart to replace the old one with which we were called. When we find ourselves in a wrong attitude or desiring wrong things, it serves as a reminder to pause and consider which heart is motivating us. Is it the new heart being formed in us, or the old heart that once defined us? We must guard this new heart that God is trying to instill in us. Jesus teaches that it is His instruction, combined with the Spirit of God, that forms this new heart, bringing us to life. The old heart, representing our former ways of thinking and acting, offers us no true benefit. If we choose not to heed God's Spirit urging us to pray, study, fast, meditate, and obey, our heart will slowly harden, and God's way of living will lose its importance. There is only one thing that can hinder us from achieving God's will for our lives: allowing our heart to become hardened and rejecting the new heart that God is working to create within us. Never let your heart become hardened, and never let down in this pursuit.

The concept of the heart represents the core of who we are, encompassing our thoughts, emotions, and actions. It is the seat of our entire being, directing how we conduct our lives. God focuses on the condition of our spiritual heart, seeking a profound transformation in our very nature to reflect Him completely. This transformation is central to our calling, as God examines our hearts to see if we are truly converted, beyond mere external observances or measurable achievements. God promises a new heart and a new spirit to His people, enabling them to obey Him fully. This new heart, given to those called by Him, is the only one we will ever have. It is a divine gift meant to inspire us to overcome, to be obedient to all of His laws, and to love one another. Through this new heart, God makes all things new, preparing us for the salvation He offers. To prepare this new heart to serve God, we must first repent, humbling ourselves deeply and turning away from wrong attitudes and actions. Secondly, we are to study diligently, seeking to understand what God expects from us as individuals, applying His Word with effort and energy. Finally, we must serve God by obeying His laws daily, loving Him with every fiber of our being, and loving our neighbors as ourselves. This consistent obedience builds godly character, aligning us with God's mind and side, fostering a joyous and liberating experience rather than a burden. God's testing, tailored to each of us, refines this new heart, ensuring we are faithful and ready for salvation. As we face trials, we trust in His faithfulness, responding with a faithful heart, full of love and obedience. By cooperating with God—repenting, learning, and doing—we prepare our new heart to serve Him, fulfilling the purpose of our calling.