Romans 8:26 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.

Your faith will take you to a new level when you become too weak to help yourself. Even if the words don't come out right, God in His infinite wisdom can still seek the desires of your heart and make you stronger to overcome any obstruction. Can't find the right words? Let God intercede.