Forgiveness and Faith – Luke 17:5-6

In Luke 17:5-6, the apostles say to the Lord, “Increase our faith”. This text continues the context of examining humility and what the humble can do. There is an inseparable relationship between humility, faith, and forgiveness. The context is Jesus commanding that if a brother sins seven times a day and repents, he must be forgiven. To forgive unceasingly around the clock is a massive burden, which is why the disciples ask for their faith to be increased.

However, the apostles misunderstood faith by asking for an increase, assuming that a bigger quantity of faith is required for a harder task. Faith is not about quantity. Christians think that if we have more faith, than they could obey the command to forgive. This assumes that bigger and increased faith leads to self-sufficiency, but having spiritual authority does not mean operating independently from God. Asking for increased faith biblically means depending on God more, but the disciples wanted a bigger tool to handle the matter themselves.

Furthermore, saving faith and everyday faith are the same plant; saving faith is the root, and everyday faith is the fruit. Believers already have this faith from conversion. So increasing faith is not about seeking a new, additional power, but living out the faith already possessed.

The Lord defines biblical faith by responding, “If you have faith like a mustard seed”. The issue is not the quantity of faith, but whether there is actual reliance on God. Not how large it is, but if you have true faith. Biblical faith means personally coming to Jesus, leaving self-reliance, and depending on Him for life. It is not just agreeing with Him, but turning from sin and turning toward Christ.

Believers are called to walk by faith, not by sight (2 Corinthians 5:7). Walking by faith does not mean ignoring reality, but relying on God’s word over human feelings and obeying even when it does not make sense. A genuine, small faith is like a mustard seed; while it does not seem impressive, it is real and mighty. Faith might be small, but what matters is that it’s real. The church is also small, a little flock, but size doesn’t matter, as long as it’s a real church. We are all little children, turning from self, letting go of control, trusting God, and depending on Him completely (Mt 18:3).

Jesus tells the disciples that with faith like a mustard seed, they could say to a mulberry tree, “Be uprooted and be planted in the sea, and it would obey you”. A mulberry tree represents something deeply rooted and humanly impossible to remove, much like the command to forgive unceasingly. Just as planting a tree in the ocean to bear fruit seems impossible, true forgiveness and salvation are impossible by human power alone, but with God, all things are possible (Mark 10:24). We must realize that salvation is God’s greatest miracle and accomplished the most difficult task, yet we are saved by faith.

Faith must be expressed and put into practice. For example, when a relative of John Macarthur’s son was tragically murdered by a robber, the parents chose to forgive the killer. How could they do that? Because God commands it and faith obeys. True faith lives in obedience, trusting and depending on the Lord. Similarly, the Roman centurion demonstrated mighty faith simply by trusting Jesus’s authority to heal his servant. His faith was not systematic with lots of details, but he expressed his faith in Jesus without needing to see anything (Matthew 8:8-9). Faith is expressive and practiced. True faith continues to trust, obey, and speak out even when nothing has happened yet and we are still waiting. There’s nothing else we can do but have faith.

Jesus concludes the definition by stating, “and it would obey you”. When real faith is practiced, it aligns with God’s will and participates in His authority. Practicing faith means the result will happen in God’s timing, or He will provide something even better for His glory (Hebrews 11:39-40). The Christian calling to forgive unceasingly, love enemies, and overcome sin is completely beyond natural ability without faith. Therefore, believers must continually practice this small but genuine faith, trusting that God is always good and His power is always enough to handle the impossible.

A Church that Jesus Builds – Luke 17:3-4

Based on today’s text, Jesus teaches that the church He builds is composed of believers marked by humility. Humility is not synonymous with low self-esteem; rather, it is rightly understanding one’s position before God and others. It consists of two essential components: obedience to the Lord in all circumstances and a genuine love for others expressed through service. As such, humility is foundational to the identity and function of a true church established by Jesus Christ.

The humble church that Jesus builds remains vigilant and spiritually alert (v. 3). In this context, Jesus understood that external influences could cause His disciples to stumble, particularly the influence of the scribes and Pharisees. Therefore, He commands them to pay careful attention and to be aware of the spiritual dangers present in the world. To “be on guard” implies discernment and readiness. The Jewish leaders posed a serious threat because they were false teachers who opposed Christ and rejected His truth.

Those who are humble practice self-denial and rest in God’s sovereignty. Without humility and spiritual alertness, it becomes difficult to rebuke others biblically and consistently. When humility is absent, confronting a sinning brother may lead to pride, anger, or bitterness rather than restoration. Sensitivity to sin diminishes, and the goal of forgiveness may be lost. Hypocrisy can emerge when forgiveness is offered halfheartedly. Failing to guard our hearts may create a chain reaction that damages relationships. In contrast, humility enables believers to respond with both truth and grace, preserving the goal of restoration through rebuke and forgiveness.

The humble church that Jesus builds hates sin and seeks restoration when sin occurs. Jesus clearly instructs His followers to rebuke a brother who sins and to forgive him if he repents (v. 3). The focus here is on relational, or horizontal, sin between believers rather than sin against God. Such sin may involve words, actions, attitudes, or any failure to uphold righteousness in relationships. Since the church is made up of imperfect people, conflict is inevitable. Nevertheless, a healthy church addresses these issues through faithful rebuke and genuine forgiveness.

The necessity of rebuke within the church is emphasized by Jesus in this passage. Its purpose is not to prove oneself right but to restore a sinning brother to fellowship with God and the church. The Old Testament provides a clear example in the life of King David, who committed grave sins. The prophet Nathan confronted David with humility, making it clear that his message came from the Lord. This account demonstrates that true rebuke always involves both truth and grace.

Rebuke, in its basic sense, means to correct, reprove, or offer sharp criticism. This is why many believers avoid it altogether. However, the biblical concept of rebuke involves speaking truth with gentleness and love. As Rod Mattoon explains, “This rebuke is to be strong enough to inspire repentance. To ‘rebuke’ does not mean to point out every sin, for Jesus also warns against being judgmental. Rebuke is always to be done in love and compassion, not in a censoring and judgmental spirit. Its purpose is to bring the sin to the attention of the offending person and restore them to fellowship with the Lord and other believers.”

In a true church, rebuke and forgiveness are normal aspects of dealing with sin. Humility is required in order to rebuke rightly. A humble rebuke does not arise from a sense of superiority or a desire to control. Instead, it is characterized by honesty, gentleness, and a desire for restoration. Scripture calls believers to restore one another in a spirit of gentleness while remaining mindful of their own vulnerability to temptation. This reflects a posture of valuing others above oneself.

Humble rebuke serves as the pathway to genuine repentance and forgiveness. Without it, sin remains concealed, allowing the sinner’s heart to grow hardened and spiritually unhealthy. Hidden sin often intensifies over time, leading to greater destruction. Therefore, humility is essential so that believers may lovingly confront sin for the spiritual benefit of others.

Rebuke grounded in truth produces repentance, and repentance opens the door to forgiveness rooted in grace. True repentance results in a transformed heart and changed behavior. Forgiveness, in turn, involves a deliberate decision not to hold the offender accountable for their wrongdoing. Believers must be committed to forgiving regardless of how their rebuke is received. This includes refusing to seek revenge, harbor grudges, or retaliate. Forgiveness is an act of obedience to God, reflecting the forgiveness believers themselves have received.

The humble church that Jesus builds forgives continually. Jesus teaches that even if a brother sins repeatedly and repeatedly repents, forgiveness must be extended each time (v. 4). This reflects the pattern of God’s own forgiveness toward His people. It also implies that believers should not keep a record of wrongs. Ongoing forgiveness is a vital expression of faithful obedience in the Christian life.

Humility undergirds forgiveness, serving as the soil in which it grows. Recognizing one’s own need for God’s mercy enables a believer to extend that same mercy to others. Forgiveness becomes the outward expression of inward humility. Where true humility exists, God is actively at work in and through that individual.

Biblical forgiveness does not mean ignoring sin for the sake of superficial peace or politeness. Nor does it imply immediate restoration of trust. Restoration is often gradual, requiring time and consistent faithfulness. True forgiveness acknowledges sin and maintains accountability. When forgiveness is absent in a church, it signals a breakdown in fellowship. Conversely, a loving church is marked by continual forgiveness exercised in both truth and grace. A failure to forgive not only damages relationships but also weakens one’s witness and hinders spiritual vitality.

Forgiveness is a lifelong discipline for the believer. In every relationship, a greater measure of forgiveness leads to greater unity and spiritual health. One may obey many commands, but without forgiveness, obedience remains incomplete. The example of Joseph illustrates this truth; forgiveness was essential to the fulfillment of God’s work in his life. Ultimately, the pinnacle of Christ’s suffering and death was the forgiveness of sinners. Forgiveness transforms the heart’s posture toward others, even when trust must be rebuilt over time. God demonstrated His power to forgive through the love and humility displayed at the cross. Without forgiveness, genuine love for God, the church, and even one’s enemies is impossible.

Therefore, believers must remain spiritually alert, engage in gentle and truthful rebuke, and extend forgiveness generously and consistently. As Jesus builds His church, the Spirit works to cultivate humility and love among His people. These qualities serve as clear marks of a church that truly belongs to God, who first loved and forgave us.

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