Galatians 5:18

But if ye be led by the Spirit
That is, of God, who is the guide and leader of his people. It is a metaphor taken from the leading of persons that are blind; as such are before conversion, and whom the Spirit of God leads in ways they knew not, and in paths they had not known: or from the leading of children, and teaching them to go; so the Spirit leads regenerate persons, and teaches them to walk by faith in Christ. This act of leading supposes life in the persons led, for dead men cannot be led; the Spirit is first a Spirit of life from Christ before he is a leader; and also it supposes some strength, though a good deal of weakness; were there no spiritual strength derived from Christ, they could not be led; and if there was no weakness, there would be no need of leading; it is an instance of powerful and efficacious grace upon them, yet not contrary to their wills, though they are led, they are not forced; they go freely, being led, as there is good reason for it; for the Spirit of God always leads for their profit and advantage, and for the spiritual delight, pleasure, and comfort of their souls; he leads out of the ways of sin, and so of ruin and destruction, and from Mount Sinai, and all dependence on a legal and moral righteousness; he leads to Christ, to his person, for shelter, safety, and salvation, to his blood, for pardon and cleansing, to his righteousness, for justification, and to his fulness, for every supply of grace; he leads into the presence of God, and to his house and ordinances; he leads into the covenant of grace, to the blessings, promises, and Mediator of it; he leads into all truth as it is in Jesus, in the ways of faith and truth, and in the paths of righteousness and holiness, and always in a right way, though sometimes in a rough one, to the city of their habitation; he leads from one degree of grace to another, and at last to glory: all which he does gradually; he leads by little and little into a man's sinfulness, and to see his interest in Christ, and by degrees into the doctrines of the Gospel, and the everlasting love of the three Persons; and proportionally to the strength he gives, and as they are able to bear: now such persons as these have nothing to fear from the law of God:

ye are not under the law;
such are not only delivered from the law in fact, but in their own apprehensions; they have the comfortable knowledge and experience of it; the law is no terrifying law to them; it works no wrath in them; they are delivered from the spirit of bondage to fear, by the Spirit of God, by whom they are led; nor are they under it, nor do they need it as a pressing forcing law to duty; they delight in it, and cheerfully serve it, being constrained by love, and not awed by fear; nor are its accusations and charges regarded, or to be regarded, by such who are led by the Spirit to Christ, the end of the law for righteousness; and they are entirely freed from its curse and condemnation, though they are under it, and desire to be under it, as held forth by Christ the King of saints; and, under the Spirit's influence and guidance, yield a cheerful and evangelical obedience to it.