Saint Augustine / Pope Gregory I / Martin Luther / Friedrich Nietzsche / Thomas Paine / Leo Tolstoy / Athanasius of Alexandria / Gregory of Nyssa / Basil the Great / John of Damascus / Saint Thomas Aquinas / Thomas à Kempis / St. Teresa of Ávila / Brother Lawrence / David Hume / Ludwig Feuerbach / Charles Spurgeon / Andrew Murray / G. K. Chesterton / Arthur Pink / John Stuart Mill / Ralph Waldo Emerson / H. Emilie Cady / James Allen / Prentice Mulford / Florence Scovel Shinn / Wallace D. Wattles | 