The works of the flesh are a constant challenge for Christians, as they stem from human nature, which is often apart from God and influenced by the desires of the flesh. These works, listed in Galatians 5:19-21, include adultery, fornication, uncleanness, licentiousness, idolatry, sorcery (pharmakeia), hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, envy, murders, drunkenness, revelries, and the like. They manifest as habitual behaviors or acts of rebellion that can exclude one from the Kingdom of God if not repented of. The flesh, from the Greek word sarx, encompasses human thoughts, feelings, desires, and activities, typically uninfluenced by God's Spirit, driving us toward gratification and corruption. To combat these tendencies, Paul advises in Galatians 5:16 to walk in the Spirit, ensuring that one does not fulfill the lusts of the flesh. This requires conducting life under the influence of God's Spirit, filling one's existence with divine guidance to leave no room for fleshly desires. In Galatians 5:24, Paul emphasizes that those who belong to Christ must crucify the flesh with its passions and desires, a process as intense and agonizing as Christ's sacrifice, demanding hard work, trials, pain, and an incredible force of will to resist temptation. Similarly, in Colossians 3:5, believers are urged to put to death earthly members such as fornication, uncleanness, passion, evil desire, and covetousness, which is idolatry, shedding the old man and adopting the new. The battle between flesh and Spirit is a daily decision, as they are diametrically opposed, with no common ground. If one sows to the flesh, corruption is reaped, but sowing to the Spirit yields everlasting life, as stated in Galatians 6:7-8. By living according to the Spirit, the law loses its power over us, as there is no transgression to condemn. The ultimate goal is to so internalize God's way that the flesh no longer tempts, a painful and extreme fight against the very nature that has guided us, requiring everything we have to overcome.

Jesus calls upon His followers to reject the natural human inclination toward self, emphasizing that the first step in Christian growth is to submit and surrender to God our will, our affections, our bodies, and our lives. Our own pleasures and happiness must no longer be primary goals; instead, we must be willing to renounce all and lay down our lives if required. Peter admonishes us to no longer live in the flesh for the lusts of men, urging us to forsake wrong desires and deny our lust of the flesh as a Christian duty. Christ further calls us to take up our cross and follow His example, a command to deny self or crucify the flesh, even to the point of death. We must be prepared to die if the course of events leads there, though often it is more about possessing an attitude of self-denial willing to give up all. Paul instructs us to put off our former conduct and put to death our sinful actions, highlighting that Christ's disciples live to serve God, not self. In the face of temptation, Jesus teaches us to practice self-denial in our actions even before committing them, as we must deny ourselves the wrong desire as soon as temptation arises. Temptations vary according to individual weaknesses, with appetite, material goods, worldly ambitions, personal prestige, and sexual desires being common areas where self-denial proves challenging for many. Jesus Himself exemplifies self-denial, teaching it to His disciples not only through His words but also by His actions. His call to self-denial follows predictions of His own sacrificial death, positioning Him as the supreme model of the self-denial He demands of others. He denies Himself any urge to avenge or threaten His persecutors, showing that by committing ourselves to God who judges rightly, we deny the temptation of worldly lusts. Self-denial is central to Paul's teaching on submission to God, as we have died with Christ and must sacrifice our lives for Him. Paul writes of God's grace training us to renounce ungodliness and worldly passions, to deny what the self desires. Genuine humility in submission is required for true self-denial, lest it become merely a counterfeit.