A businessman from time to time would have to write a report to the chairman of the board of his corporation. He would write the letter and would give it to his secretary, and she would read it, then type it for him on the company letterhead. To his approval she would correct grammatical mistakes and misspellings, then she would send the letter off to his superiors.
After doing this many times, he received a commendation for his good and timely reports that helped improve their business. Now, he knew deep in his heart that he had commented on a few things and suggested others, but he really didn't feel that he deserved such accolades.
So he went back to the reports that he hand-wrote and compared them with the ones his secretary typed. He discovered that his secretary had typed not what he said but what he really meant, and with the award that he received he gave to her an award of her own.
This story shows us just what the Holy Spirit does for us. We pray our prayers to the Lord with our hearts not sure of what to pray for, and the Holy Spirit intercedes and says it for us.