Galater 5:16

This I say then--Repeating in other words, and explaining the sentiment in Gal 5:13, What I mean is this." Walk in the Spirit--Greek, "By (the rule of) the (Holy) Spirit." Compare Gal 5:16-18, Gal 5:22, Gal 5:25; Gal 6:1-8, with Rom 7:22; Rom 8:11. The best way to keep tares out of a bushel is to fill it with wheat. the flesh--the natural man, out of which flow the evils specified (Gal 5:19-21). The spirit and the flesh mutually exclude one another. It is promised, not that we should have no evil lusts, but that we should "not fulfil" them. If the spirit that is in us can be at ease under sin, it is not a spirit that comes from the Holy Spirit. The gentle dove trembles at the sight even of a hawk's feather.

In this chapter the apostle comes to make application of his foregoing discourse. He begins it with a general caution, or exhortation (Gal 5:1), which he afterwards enforces by several considerations (Gal 5:2-12). He then presses them to serious practical godliness, which would be the best antidote against the snares of their false teachers; particularly, I. That they should not strive with one another (Gal 5:13-15). II. That they would strive against sin, where he shows, 1. That there is in every one a struggle between flesh and spirit (Gal 5:17). 2. That it is our duty and interest, in this struggle, to side with the better part (Gal 5:16, Gal 5:18). 3. He specifies the works of the flesh, which must be watched against and mortified, and the fruits of the Spirit, which must be brought forth and cherished, and shows of what importance it is that they be so (Gal 5:19-24). And then concludes the chapter with a caution against pride and envy.

5:16-26 A law-free faith will not lead to moral ruin because having the Holy Spirit to guide people’s lives changes their hearts to follow the will of God and not sin (cp. Jer 31:33; Heb 8:10).