“In the same way, the Spirit helps us in our weakness. We do not know what we ought to pray for, but the Spirit himself intercedes for us with groans that words cannot express.”
The Holy Spirit in the New Testament is always linked with communication between God and Man. Even the miracles, made possible by the Holy Spirit, were a guarantee that the words and teachings accompanying the miracles were from God. This was needed before the New Testament was written. But the Holy Spirit does more than this.
God speaks to us in his Word, the Bible. Then we speak to him in return in prayer. But sometimes all we can do is bow our head in silence and know that God understands ~ His Spirit communes with our spirit. How blessed we are.