Romans 8:26-27

26 Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us[a] with groanings which cannot be uttered. 27 Now He who searches the hearts knows what the mind of the Spirit is, because He makes intercession for the saints according to the will of God.

There is power in prayer. But in addition to the power, there is also a deep mystery of prayer. The mystery of prayer is a delicate mechanism that words cannot interrupt, preachers cannot explain, and the humblest believer recognizes though he does not understand it. We bear love that our simple minds cannot understand. It is an echo from God's throne and a faint whisper from His heart. Our prayers are often groans, rather than songs, and the mystery of that groaning we sometimes do not understand ourselves, for it is God praying through us, a need that demands His touch, a direction that only he understands.

So in prayer we sometimes don't even speak to Him, nor hear Him, but we still have communion with Him. It is this fellowship, this loving relationship, that appears in our prayer. It is mysterious, and more meaningful than words. How wonderful it is to know that with this mystery lies the power of God - a power too complicated to put into words, and too mysterious to understand - a sweet power with which we may use to fall back into His arms, even when our prayer is more than what we speak.