Galatians 5:16

Paul gives a direct instruction with a promise attached: walk in the Spirit, and you will not carry out the cravings of the flesh. "Walk" is his picture for the ordinary, step-by-step conduct of daily life -- not an occasional act but the steady direction of how a person lives. The remedy he offers for self-centered desire is not gritted-teeth self-denial alone but a way of living guided by God's Spirit.

The "flesh" here names the pull toward self that opposes what the Spirit wants, and Paul has just listed the love and service that mark the better way. His point is that the two forces head in opposite directions, and the answer to one is to move steadily toward the other. He does not say "try harder not to sin"; he says walk in the Spirit, and the craving will not win the day. There is genuine effort in walking -- it is active, deliberate, ongoing -- but the power is the Spirit's leading. This frees the struggling believer from the despair of mere willpower while still calling for real participation. Victory comes not by staring at the desire you want to defeat, but by walking forward in step with the Spirit.