Excerpt by Gerald Wolfe
"I think every one of us sometimes has hurts that are too deep to even admit to our closest friend. Sometimes, we struggle with things that we are certain those around us wouldn't understand. In those times, it's hard to put our feelings together into words to pray. The good news of Romans 8:26 is that in those times of utter helplessness - when we can't express ourselves to God - the Holy Spirit, Himself, takes the cry of our heart directly before the throne of God, and speaks directly to God in our behalf. The Holy Spirit uses a form of communication that can only be understood by God. Those "groanings" express our innermost feelings...the feelings of the soul. These "groanings" can't be put into human words, but thankfully, the One who created us is listening - and He understands - perfectly."
- Gerald Wolfe - Greater Vision
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 with groanings which cannot be uttered.