What does the Holy Spirit have to do with prayer? In his sermon on Ephesians 2:18 titled “Praying in the Spirit,” Dr. Martyn Lloyd-Jones seeks to impress on the believer the absolute necessity of prayer and of the role of the Holy Spirit in prayer. According to Dr. Lloyd-Jones, praying in the Holy Spirit “is the very essence of prayer.” Also, in light of God’s stunning love that brings His children to Him, “prayer is the supreme activity of the human soul.” Many people think that prayer is as simple as saying “their prayers,” but Dr. Lloyd-Jones critiques the phrase “saying our prayers” as being antithetical to prayer itself. Prayer is much deeper than this simplistic understanding because it is a Holy Spirit-lead endeavor. Dr. Lloyd-Jones goes as far as to say, “The Holy Spirit is as essential to prayer as the Lord Jesus Christ Himself.” According to Dr. Lloyd-Jones, Jesus died that all might have access to the Father and the Holy Spirit makes real to the believer all that Jesus died for. Both must be held together if prayer is going to be true prayer.

http://www.mljtrust.org/sermons/praying-in-the-spirit/