If we {l} live in the Spirit, let us also walk in the Spirit.

(l) If we are indeed endued with the quickening Spirit, who causes us to die to sin, and live to God, let us show it in our deeds, that is, by holiness of life.

People's New Testament

5:25 Let us also walk in the Spirit. If we are born again, and have a spiritual life, let us show it by walking in obedience to the Spirit.

Wesley's Notes

5:25 If we live by the Spirit - If we are indeed raised from the dead, and are alive to God, by the operation of his Spirit. Let us walk by the Spirit - Let us follow his guidance, in all our tempers, thoughts, words, and actions.

Jamieson-Fausset-Brown Bible Commentary

25. in . in-rather, as Greek, "If we live (see on [2356]Ga 5:24) BY the Spirit, let us also walk (Ga 5:16; 6:16) BY the Spirit." Let our life in practice correspond to the ideal inner principle of our spiritual life, namely, our standing by faith as dead to, and severed from, sin, and the condemnation of the law. "Life by (or 'in') the Spirit" is not an occasional influence of the Spirit, but an abiding state, wherein we are continually alive, though sometimes sleeping and inactive.

Matthew Henry's Concise Commentary

5:16-26 If it be our care to act under the guidance and power of the blessed Spirit, though we may not be freed from the stirrings and oppositions of the corrupt nature which remains in us, it shall not have dominion over us. Believers are engaged in a conflict, in which they earnestly desire that grace may obtain full and speedy victory. And those who desire thus to give themselves up to be led by the Holy Spirit, are not under the law as a covenant of works, nor exposed to its awful curse. Their hatred of sin, and desires after holiness, show that they have a part in the salvation of the gospel. The works of the flesh are many and manifest. And these sins will shut men out of heaven. Yet what numbers, calling themselves Christians, live in these, and say they hope for heaven! The fruits of the Spirit, or of the renewed nature, which we are to do, are named. And as the apostle had chiefly named works of the flesh, not only hurtful to men themselves, but tending to make them so to one another, so here he chiefly notices the fruits of the Spirit, which tend to make Christians agreeable one to another, as well as to make them happy. The fruits of the Spirit plainly show, that such are led by the Spirit. By describing the works of the flesh and fruits of the Spirit, we are told what to avoid and oppose, and what we are to cherish and cultivate; and this is the sincere care and endeavour of all real Christians. Sin does not now reign in their mortal bodies, so that they obey it, Ro 6:12, for they seek to destroy it. Christ never will own those who yield themselves up to be the servants of sin. And it is not enough that we cease to do evil, but we must learn to do well. Our conversation will always be answerable to the principle which guides and governs us, Ro 8:5. We must set ourselves in earnest to mortify the deeds of the body, and to walk in newness of life. Not being desirous of vain-glory, or unduly wishing for the esteem and applause of men, not provoking or envying one another, but seeking to bring forth more abundantly those good fruits, which are, through Jesus Christ, to the praise and glory of God.