|St. Augustine and the Fire of Wisdom|
"PRAYER FROM THE HEART"
"If the cry to the Lord uttered by those who pray is made with the sound of the bodily voice, [but] without the heart being turned to God, who can doubt that it is made in vain? But if it comes from the heart, even if the bodily voice is silent, it can be concealed from everyone else but not from God.
Therefore, when we pray--whether aloud as required or silently--to God, our cry must come from the heart." Commentary on Psalm 118.