Galatians 5:16

This I say then, walk in the Spirit
The advice the apostle thinks fit to give, and which he would have observed, is, to "walk in the Spirit", that is, either after the Spirit of God; making the word inspired by him the rule of behaviour, which as it is the standard of faith, so of practice, and is the lamp unto our feet, and the light unto our path; taking him himself for a guide, who not only guides into all truth, but in the way of holiness and righteousness unto the land of uprightness; and depending upon his grace and strength for assistance throughout the whole of our walk and conversation: or in the exercise of the graces of the Spirit of God; as in the exercise of faith upon the person and grace of Christ, of which the Spirit is the author; and in love to God, Christ, and one another, which is a fruit of the Spirit; and in humility, lowliness of mind, meekness and condescension; all which is to walk in the Spirit, or spiritually, and strengthens the argument for love the apostle is upon: and this he encourages to by observing,

and ye shall not fulfil the lust of the flesh;
he does not say there shall be no flesh, nor any lust of the flesh in them if they walk spiritually; or that the flesh should not act and operate in them; or that they should do no sinful action; all which is only true of Christ; and the contrary is to be found and observed in all true Christians, though ever so spiritual; but that they should not fulfil or perfect the lust of the flesh; should not give up themselves entirely to the power and dictates of the flesh, so as to be under it and at its command, and be obedient servants and slaves unto it; for, in this sense only, such that are spiritual do not, commit sin, they do not make a trade of it, it is not their constant employ or course of conversation.