The worst prison is a closed heart. (sign at N Assembly of God)
*HEART
"The Prayer of the Heart" teaches not to follow rituals mechanically or not to pray without really being present; otherwise you practice only the form, not the essence. When you practice the essence, your mind becomes clear and you attain joy. (Buddha, Christ, p126)
Prayer from the heart - practice prayer with modesty, humility, justice, good deeds, faith, and generosity. In this way you will make it a perfect dwelling place for the Lord... his image enthroned in the temple of your spirit. (St. John Chrysostom, Bishop 300-400AD)
Men want God in the mind, not in the heart, for if God is had merely in the mind He is held tentatively, and the will is free to be its own master. (Confessions, Augustine)
Thou hast made us for Thyself, and our hearts are restless 'till they rest in Thee! (Confessions, St. Augustine)