There is no better biblical example of walking according to the desires of the flesh than Samson
FOREVER TRIUMPHANT, Day 16—Lenten Devotionals
16 But I say, walk by the Spirit, and do not gratify the desires of the flesh. 17 For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh; for these are opposed to each other, to prevent you from doing what you would. 18 But if you are led by the Spirit you are not under the law. 19 Now the works of the flesh are plain: fornication, impurity, licentiousness, 20 idolatry, sorcery, enmity, strife, jealousy, anger, selfishness, dissension, party spirit, 21 envy, drunkenness, carousing, and the like. I warn you, as I warned you before, that those who do such things shall not inherit the kingdom of God. 22 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, 23 gentleness, self-control; against such there is no law. 24 And those who belong to Christ Jesus have crucified the flesh with its passions and desires. Galatians 5:16-24
What does “flesh” mean here? It means essentially all behavior and thought patterns that arise from self-centeredness, from a desire to do one’s own will. “Spirit”, on the other hand, is seen in those thoughts and actions that arise from a desire to freely submit to God’s will. Spirit recognizes the Lordship of Jesus and seeks to be shaped into His likeness. Flesh spawns a whole host of enemies that all come from the heart, mind, and soul of the Christian.
FJHUEGEL: Paul tells us in Galatians 5 that the Spirit and the flesh are pitted against each other in mortal combat. Never were opposing forces more relentless in their determination to crush each other. Theirs is an undying enmity. They are as irreconcilable as light and darkness. They are forever at each other’s throats. The Christian must overcome the flesh, for if the monster overcomes him and is master, the works of the flesh which are enumerated by the apostle in Galatians 5, hideous as a satanic brood from Hell, are sure to be in evidence. Some of them may be dressed up in religious garments and appear as holy sectarian zeal, but that does not change their essential character. “Flesh” may mean zeal for a holy Christian cause, a zeal whose motives are wrong. Sectionalism, partisanism, sectarianism, however holy their garments may be, can have no other source than flesh. The Savior prayed that His followers might be one, which means the slaying of the principle of the self-life. Flesh appears in exceedingly legitimate, refined forms. Still, however refined the forms, it is always and only at enmity with the true Christian spirit. You cannot make a lamb out of a tiger. You cannot make spirit out of flesh.