From Robert L. Millet:
If we are willing to move beyond a casual relationship with God, willing to spend time and exert energy necessary to make of our prayer life something more than it is now, then great things await us. For one thing, in time and with experience, our prayers can become more than petitions, as important as it is to petition the Lord. Our prayers can become instructive, the means whereby God can reveal great and important things to us. The apostle Paul taught us that “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 [striving] which cannot be [expressed].” (Romans 8:26) That is to say, if we are quiet and attentive, the Spirit of the Lord can, on some occasions, lead us to pray for things that were not on our agenda, things deep down, things that pertain more to our eternal needs than our temporal wants. At such times we find words reaching beyond our thoughts, praying for people and circumstances and eventualities that surprise us. ~Robert L. Millett. From “A Year of Powerful Prayer” Salt Lake City: Deseret Book, 2013) 167-68
see also (Romans 8:26.) (Compare Joseph Smith, Teachings of the Prophet Joseph Smith, comp. Joseph Fielding Smith [Salt Lake City:Deseret Book, 1976]278; 3 Nephi 19:24; Doctrine & Covenants 46:30;50;29-30; 63:65