Adam Clarke on Romans 8:14

For as many as are led by the Spirit, etc. - No man who has not Divine assistance can either find the way to heaven, or walk in it when found. As Christ, by his sacrificial offering, has opened the kingdom of God to all believers; and, as a mediator, transacts the concerns of their kingdom before the throne; so the Spirit of God is the great agent here below, to enlighten, quicken, strengthen, and guide the true disciples of Christ; and all that are born of this Spirit are led and guided by it; and none can pretend to be the children of God who are not thus guided.