“Meditation is the activity of calling to mind, thinking over, dwelling on, and applying to oneself the various things one knows about the works and ways and purpose and promises of God…. Its purpose is to clear one’s mental and spiritual vision of God, and to let his truth make its full and proper impact on one’s mind and heart.” J. I. Packer, Knowing God (InterVarsity Press, 1973), pp. 18-19