Matthew Poole and continuators on Galatians 5:18

18 But if ye be led by the spirit, ye are, not under the law .

To be led by the Spirit, and to walk in the Spirit, are the same thing; and differ only as the cause and the effect. To be under the law, is to be under the curse of it, or coaction of it, and an obligation to the performance of the ceremonial Law. The reason is, because the Spirit is a Spirit of Adoption and liberty; and where it is, it teacheth to serve the Lord without fear from a principle of freedom and ingenuity.

Marginal references: Rom. 6 & 8.2.