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