The church is called to a process of perfecting, focusing on personal overcoming and growing in the grace and knowledge of Jesus Christ. This involves becoming more submitted to God, refining character and attitudes, and improving relationships within marriages, with children, and among brethren. Through a much closer relationship with God, the church seeks to apply every possible moral, spiritual, and ethical aspect of the gospel of the Kingdom of God. The main thrust of the church should shift toward preparing a people for the events of the end time and for marriage with the Bridegroom, emphasizing the urgency of this responsibility as Christ's return draws near.

The perfecting of the church emerges as the central purpose behind God's calling of a specific, called-out people throughout history. The church is not a building but a living, spiritual organism—described in Scripture as a spiritual house built of "living stones," as the body of Christ with Him as its Head, and as a bride being prepared for marriage. Unlike ordinary buildings, this structure is alive, growing, and being fitted together for a purpose that unfolds progressively through history. Herbert W. Armstrong's teaching clarifies that the church was never intended as God's instrument for immediately saving the world. Rather, Christ called out disciples—students—to learn the true gospel of the Kingdom and to be trained in God's government and character. The church's real purpose is to prepare a qualified, tested personnel of God-beings who will reign with Christ, having rejected Satan's way and proved loyalty to God's righteous government. It functions as God's "training school" or "teacher's college," producing kings and priests for the coming Kingdom rather than merely converting individuals. This perfecting process is traced historically: God gave dominion to angels, who rebelled; then to Adam and Eve, who also failed; then He worked through Israel under the Old Covenant, which required only three days of consecration and never included the gift of God's Spirit for conversion. Israel failed as God's witness and covenant partner because of unbelief, prompting God to establish a New Covenant—superior because it demands a lifetime of sanctification and offers forgiveness, the Holy Spirit, and access to God through Christ. This New Covenant is explicitly a marriage covenant, paralleling Israel's covenant at Sinai but requiring far greater sanctity. The church, as the bride, must be cleansed inside and out, clothed in "fine linen, clean and bright," representing the righteous acts of the saints. Since Israel failed to produce the "godly offspring" God sought, that expectation now rests on the church's union with Christ, from which spiritual children will be born, beginning in the Millennium. Paul's argument in Romans 9-11 reveals that the church's calling exists precisely because Israel stumbled; the "firstfruits" church will later be instrumental in Israel's national salvation, and together, the perfected church and converted Israel will extend salvation to the Gentile nations, culminating in the outpouring of God's Spirit on all flesh after the Millennium. Ultimately, the church's perfecting is bound to Christ's return: only when the called-out ones have developed godly character and reflect God's image will the church be "finished and prepared" for its designed work—ruling, teaching, and reconciling humanity to God as part of the divine Family's expansion.

The growth of God's children into spiritual maturity stands as a central concern reflecting His love in calling us His own, not merely in name but in actual fact. Because we are truly God's children now, spiritual growth becomes as natural and expected as the physical and mental growth we witness in our own children. God views the absence of such growth with the same concern parents feel when a child fails to develop properly due to disease or poor nutrition; this concern led Him to establish spiritual maturity as a foundational doctrine of the church, exhorting believers to "go on to perfection" (Hebrews 6:1). Recognizing how vital this growth is, God designed human physical life so that we experience the process of growth twice, once as children and again as parents raising children, so that these physical realities might serve as instructive pictures of spiritual development. Several principles emerge from this comparison. Growth is orderly, occurring in predictable stages, meaning believers must first digest the "milk" of God's Word before handling its "meat" (Hebrews 5:12-14). Growth is also planned, with God calling believers to a vast potential, though attaining it depends on choices, avoiding the corrosive effects of sin, maintaining right attitudes during trials, and feeding on God's Word rather than the "junk food" of worldly philosophies (Deuteronomy 8:3; Matthew 4:4). Growth is characteristically slow but undeniable over time, and it often occurs in uneven spurts, with seasons of discouragement temporarily halting progress until God intervenes to renew growth in those who maintain a good attitude. Viewed retrospectively, however, growth that seemed painfully slow will likely appear to have happened swiftly, especially once believers share God's perspective in which a day is as a thousand years (II Peter 3:8). The pattern of Israel's gradual conquest of the Promised Land, driven out "little by little" so the land would not become desolate (Exodus 23:28-30), illustrates how believers will likewise grow into their inheritance in the Kingdom of God, progressively overcoming Satan, the world, and human nature. Christ's parable of the mustard seed, which starts small yet grows into something greater than all herbs (Mark 4:31-32), and the Parable of the Talents, where faithful growth receives commendation while stagnation is condemned as wicked and unprofitable (Matthew 25:14-30), reinforce how essential this ongoing perfecting process is to God. Ultimately, the vastness of the potential God has given us exceeds present understanding (I Corinthians 2:9), yet patient, steady growth will one day allow that inheritance to fit us perfectly, much like a child's oversized clothing eventually fits through the natural process of maturing.

Trials and suffering are woven throughout God's purpose for humanity, shaping His people for their eternal inheritance. I Peter, the "wilderness epistle," portrays believers as pilgrims whose faith is tested through suffering so that perseverance, humility, compassion, and godly character may be developed. Trials are not merely hardships to endure but opportunities to actively apply faith—to choose trust and obedience when circumstances are difficult. As James demonstrated through Abraham, faith is perfected through action. Suffering also draws believers together, teaching them to care for, pray for, and strengthen one another. Though we may not fully understand why God permits trials, Scripture assures us that He remains near to the brokenhearted and uses temporary suffering for an eternal purpose. Our calling is to set our will to believe, act faithfully, and remain steadfast as God prepares us for His Kingdom.