Life's great teachers are friendship, occupation, travel, books, marriage, and chiefly heart-hungers. These yearnings within are the springs of all man's progress without. Sometimes philosophers say that the history of civilization is the history of great men. Confessing this, let us go on and note that the history of all great men is the history of their ideal hours, realized in conduct and character. Waking at midnight in his bleak garret, the vision splendid rose before John Milton. The boy of twelve would fain write a poem that the world would not willingly let die. He knew that whoever would write a heroic poem must first live a heroic life. From that hour the youth followed the ideal that led him on, pursuing knowledge unceasingly for seven years, never closing book before midnight, leaving Cambridge with the approbation of the good, and without stain or spot upon his life. Afterward, making a pilgrimage to Italy for study in that land of song and story, he heard of the civil wars in England, and at once returned, putting away his ambition for culture because he thought it base to be traveling in ease and safety abroad while his fellow-citizens were fighting for liberty at home. When he resisted a brutal soldier's attack who lifted his sword to say, "I have power to kill you," the scholar replied: "And I have power to be killed and to despise my murderer." Growing old and blind, and falling upon evil days and tongues, out of his heroic life he wrote his immortal poem. Dying, he still pursued his ideal, for moving into the valley and shadow, the blind poet whispered: "Still guides the heavenly vision!"