Christ replies to the question of why His disciples do not fast like the Pharisees with illustrations that emphasize the need for beliefs and actions to be correct and appropriate to God's way of life. In His second illustration, Jesus draws from the common knowledge that no one would waste a piece of new cloth to repair an old garment. If new cloth is used to patch an old garment and becomes wet, it shrinks as it dries, straining the old fabric and worsening the tear. Jesus shows that His new doctrines do not align with the old rites of the Pharisees, which involved frequent fasting. Combining His teachings with their old ways would distort the truth. The old human way of life must be completely replaced with the new godly way, as they are incompatible due to the righteousness and spiritual strength of God's new way against the weakness and wickedness of the old.

In the gospel accounts, Jesus frequently encountered the Pharisees and other religious authorities who questioned Him on every point, seeking fault. One such exchange resulted in the Parable of the Cloth and the Wineskins, found in all three synoptic gospels, with Luke's version being the fullest. In this parable, Jesus illustrates that no one puts a piece of new cloth on an old garment, for the patch will tear away from the old, making the tear worse. This signifies that the old ways are incompatible with the new teachings He brings. The new cloth represents the fresh and dynamic nature of His message, which cannot be merely patched onto the old, rigid traditions without causing disruption. Attempting to combine the two will result in damage, as the old cannot contain or adapt to the new without breaking apart.

The Parable of the Old and New Clothing, together with its companion parable of the wineskins, emerges as the culmination of a broader discussion establishing that the new man is none other than Christ Himself, put on at baptism when a person sinks into Him, as Paul explains in Galatians 3:27. Having shown that putting on Christ involves reconciliation and a profound mutual indwelling—Christ in the believer and the believer in Christ—the discussion turns to Christ's own teaching about mixing old and new, using imagery drawn from clothing and wine to reinforce the impossibility of blending the old man with the new. The Parable of the New Cloth on the Old Garment, recorded in Matthew 9:16, Mark 2:21, and Luke 5:36, teaches that no one places a patch from a new garment onto an old one, since the new patch will not match and will eventually tear away, worsening the damage. This illustrates that donning the new man and discarding the old man cannot be attempted halfway; the two represent utterly opposing ways of life that cannot be combined, just as no one can serve two masters according to Matthew 6:24. This point is reinforced by the companion Parable of New Wine in Old Wineskins, found in Matthew 9:17, Mark 2:22, and Luke 5:37-39. New wine placed in old wineskins bursts them, spilling the wine and ruining the skins. Applied to the old and new man, mixing them leads to mutual destruction: the new man corrupted, the old man useless. This confirms that the old and new man are irreversibly incompatible, and God requires a definite choice between them rather than an attempted fusion. The discussion then moves to establish that the new man—Christ—is decisively better than the old man. The miracle at Cana, where Christ turned water into wine, illustrates that what God produces through Christ, with human cooperation, surpasses anything man alone can make, as the master of the feast declared the later wine better than the first. Hebrews reinforces this theme, describing Christ's ministry, covenant, promises, country, and resurrection as all superior to what preceded them. Yet Christ's own lament in Luke 5:39—that no one desiring new wine says the old is better—captures a perverse tendency in human nature to prefer the old, spiritually speaking, even while readily embracing new things physically. This tendency echoes Adam's original acceptance of Satan's deception, a pattern many have repeated ever since by rejecting the true gospel in favor of familiar falsehoods. The clothing and wine imagery ultimately reinforces the necessity of decisively rejecting the old man's ways in favor of Christ's superior new way, made possible only through being endued with power from on high—the Holy Spirit—which enables believers to recognize and overcome Satan's deceptions. Having tasted both the old and new wine, true Christians are called to remain steadfast in the new covenant, praying for endurance so as never to fall back into believing that the old is better.