"The Spirit, therefore, not only openeth and applieth the promises to the heart; but, openeth the heart for the comfort of the promises; and then pours consolation into it. He comforts the saints also, by enabling them to trust that, in the Lord Jesus, they have righteousness and strength, forgiveness of sins, and a title to eternal life; as well as, by renewing them after the image of the Son of God, and so, uniting their hearts to the holy will of God. The original word, in the New Testament, which we have translated, a Comforter, signifies likewise, an Advocate [John 14.16].
One special way, in which, the Holy Spirit comforts believers, is the exercise of his Advocacy or intercession in them. The more they are enabled to pray in faith, the more do they walk in the fear of the Lord, and in the comfort of the Holy Ghost."John Colquhoun. A Treatise on Spiritual Comfort, 1814