God evaluates our hearts and desires us to be in His Family, yet He insists on a profound transformation before we can join Him. This transformation centers on a change of heart, the most critical change we must undertake. Our lifelong experiences have shaped our hearts and minds, forming deep-seated habits and behaviors that resist alteration, much like a rubber strip that snaps back to its original form when stretched. This internal resistance, rooted in our carnal nature, opposes the adoption of the new man as described in Ephesians 4, making change a formidable challenge. To effect this change of heart, we must recognize and be convicted of the need for transformation, evaluating ourselves against God's righteousness and holiness. We must categorize necessary changes into actions such as start, do more, stop, or do less, and understand the reasons behind them. Envisioning the differences in ourselves and our relationships post-change is crucial. Despite the discomfort and the time it takes—often longer than our impatient human nature desires—endurance and commitment are essential to complete this process. The inward, spiritual man, our heart, is renewed day by day through these trials, promising an eternal weight of glory. Ultimately, maintaining faith in God the Father and Jesus Christ is vital, as They enable all change. Our carnal minds fiercely resist spiritual transformation, necessitating the assistance of God's Holy Spirit. We must daily seek His strength to keep our hearts focused on positive change amidst trials. God has called us to this process of spiritual preparation for His Kingdom, requiring us to put off the old man and put on the new, developing attitudes, desires, and behaviors modeled after His holy character. Successful change of heart is not optional but a divine requirement for our spiritual renewal.

The heart, as depicted in Scripture, represents the core of our being, encompassing our thoughts, emotions, and actions. It is the seat of life and the focus of Jesus Christ's examination of us. A change of heart signifies a profound transformation, a shift in mind and nature to reflect God's character completely. This transformation is the essence of our calling, as God seeks not just outward compliance but a deep, internal conversion. God looks beyond appearances and outward actions, focusing on the heart, as seen in I Samuel 16:7, where the Lord instructs Samuel not to consider physical stature but to recognize that He sees the heart. Similarly, in I Kings 8:39, it is affirmed that God alone knows the hearts of all, responding to each according to their ways. Hebrews 4:12-13 further emphasizes that God's Word pierces to the innermost thoughts and intents of the heart, leaving all things exposed before Him to whom we must give account. Preparing the heart to serve God is a vital command, echoed in I Samuel 7:3, where Samuel urges Israel to return to the Lord with all their hearts, putting away foreign gods and serving Him only. This preparation involves setting the mind to obey God's instructions fully, as seen in the call to direct hearts to the Lord and serve Him alone. The necessity of this change is underscored in II Chronicles 12:14, where King Rehoboam's failure to prepare his heart to seek the Lord led to evil actions, contrasting with Jehoshaphat in II Chronicles 19:3, whose prepared heart to seek God was noted despite his mistakes. Repentance is the first step in this transformation, as illustrated in Nehemiah 9, where Israel acknowledged their sins and sought to return to God with a whole heart, recognizing the need for a fundamental change in mindset and actions. The second step is diligent study of God's Word, as urged in II Timothy 2:15, to present oneself approved to God, rightly dividing the truth. This active pursuit of knowledge and obedience shapes the heart to align with God's will. Serving God with a prepared heart involves loving Him with every fiber of our being and loving our neighbor as ourselves, putting God's laws into daily practice. This obedience fosters godly character, a result of drawing close to God through prayer, fasting, study, and application of His Word. As stewards of God's calling, we must be faithful, devoted to our Master's service, and focused on gaining His approval, as highlighted in I Corinthians 4:2 and Ephesians 6:5-7. Ultimately, the time for judgment begins at the house of God, as stated in I Peter 4:17, where testing defines our true standing before Him. God places His laws in our hearts, as promised in Hebrews 10:16, urging us to draw near with a true heart in full assurance of faith. By repenting, learning, and serving, we prepare our hearts to serve God, aligning ourselves with His purpose and responding faithfully to His calling.

The concept of a change of heart is central to the spiritual journey of seeing God. Blessed are the pure in heart, for they shall see God, as stated in Matthew 5:8, emphasizes the necessity of inner purity. The Greek word for pure, kataros, means clean, without stain or blemish, and metaphorically implies being guiltless, blameless, and sincere. This purity is not merely external but pertains to the inner being, the heart, which in Greek is cardia and in Hebrew is leb, representing the core of a person's character, emotions, intellect, and will. The heart is often depicted as the source of human nature, which can be inclined toward good or evil. Deuteronomy 5:29 reveals God's desire for a heart in His people that would fear Him and keep His commandments, indicating a need for an attitude of receptivity and devotion. However, Jeremiah 17:9-10 describes the heart as deceitful and desperately wicked, beyond human ability to cure, requiring a spiritual washing through God's Spirit for any improvement. Jesus echoes this in Mark 7:20-23, stating that what defiles a person comes from within the heart, including evil thoughts and actions, highlighting the need for a fundamental change in one's inner nature. This change begins with God's initial purification through justification, as seen in Hebrews 9:22 and Titus 2:13-14, where Christ's blood redeems and purifies believers from lawless deeds. Acts 15:8-9 further illustrates this by showing God purifying hearts by faith, acknowledging believers with the Holy Spirit. Yet, this is only the starting point. Believers must actively participate in purifying their hearts, a lifelong process of transforming the mind and replacing carnal tendencies with the fruit of God's Spirit, as urged in James 4:7-9. This involves submitting to God, resisting evil influences, and cleansing both actions and inner inclinations, addressing the double-mindedness that results from the conflict between human nature and the mind of Christ. The process of heart purification manifests in love, as noted in I Peter 1:22-23, where obeying the truth through the Spirit leads to fervent love from a pure heart. The ultimate goal of God's instructions is to teach believers to love as He does, shaping their character to reflect His. I John 3:3 underscores that everyone who hopes to see Him as He is must purify themselves, striving to be like Him. This purification is essential to ascend into God's presence, as Psalm 24:3-6 describes those with clean hands and a pure heart as the true descendants of Jacob, the generation who seek God's face and stand in His holy place. Thus, a changed heart, purified through ongoing effort and God's grace, is vital to truly seeing and knowing God.