“Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God”. Romans 8:26-27
This is the deep mystery of prayer. This is the delicate divine mechanism which words cannot interpret, and which theology cannot explain, but which the humblest believer knows even when he does not understand.
Oh, the burdens that we love to bear and cannot understand! Oh, the inarticulate out-reachings of our hearts for things we cannot comprehend! And yet we know they are an echo from the throne and a whisper from the heart of God. It is often a groan rather than a song, a burden rather than a buoyant wing. But it is a blessed burden, and it is a groan whose undertone is praise and unutterable joy. It is “a groaning which cannot be uttered.” We could not ourselves express it always, and sometimes we do not understand any more than that God is praying in us, for something that needs His touch and that He understands.
And so we can just pour out the fullness of our heart, the burden of our spirit, the sorrow that crushes us, and know that He hears, He loves, He understands, He receives; and He separates from our prayer all that is imperfect, ignorant and wrong, and presents the rest, with the incense of the great High Priest, before the throne on high; and our prayer is heard, accepted and answered in His name. – A. B. Simpson