August 20 is the feastday of St. Bernard of Clairvaux. This description of the saint comes from one of the classic biographies from the mid-19th century:
"It was decided that a larger assembly should be called together at Vézelay, in the county of Nivernais (in Burgundy), at Easter-tide, so that on the very feast of the Lord's Resurrection, all those who were touched by His grace might concur in the exaltation of the cross of Christ. . . .
"[Pope] Eugenius III . . . sent, as his delegate, the man whose authority surpassed, in some sort, that of the Pontiff himself; and when St. Bernard received the commission to preach the Crusade, its success was already insured beforehand.
"The humble monk of Clairvaux was overwhelmed with fear by the orders of the Holy See. He was, at that time, in the fifty-fourth year of his age; but his fragile and languid frame was so attenuated and weakened by austerities, and so exhausted by long sufferings, that his life seemed to be prolonged by a miracle. It was with difficulty that he could support himself on his feet, and for three years he had not left his monastery except when obliged by the most important affairs of his order; and even on these occasions, he was frequently compelled to excuse himself; for, as an old chronicler says, 'he was almost dead, and you would have thought he was about to breathe his last. And yet, this frail and emaciated body was animated by a superhuman strength when it became the organ of the Spirit of God.' 'At such times,' writes one of his contemporaries, 'he gradually became animated, and his sweet and burning words flowed from his lips, like a river of milk and honey, which sprang from his heart as from a furnace of divine love.'
"The monk Wilbold, Abbot of Monte Cassino, who had seen St. Bernard a few years before, and had been struck with his eloquence, writes as follows, on the subject: 'This venerable man is exceedingly pale, being attenuated by the fasts and excessive austerities of the desert; he bears the deepest traces of humility, compunction, and penance; he breathes such perfect sanctity, that his very appearance has a persuasive eloquence, even when he does not open his lips. He is endowed with great genius and wonderful talents; he speaks with simplicity; his enunciation is clear, powerful, and full of unction; his action is always easy and natural; his manner full of grace and truth. The sight of this great man is a most moving sermon; his discourses edify, and his example incites to virtue."
- L'Abbé Theodore Ratisbonne, The Life and Times of St. Bernard, translated from the French by the Sisters of St. Mary's Convent, Greenwich. French edition originally published 1842; English translation 1855.
Here are links to some other books related to St. Bernard:
Bernard of Clairvaux, Selected Works (Classics of Western Spirituality Series), 1987.
Bernard of Clairvaux, On the Song of Songs.
Cistercian Publications' Series on St. Bernard of Clairvaux
Pierre Aubé, Bernard de Clairvaux, 2003.
Jean LeClercq, Bernard of Clairvaux and the Cistercian Spirit.
Jean LeClercq, Bernard of Clairvaux: Studies Presented to Dom Jean LeClercq.
Jean LeClercq, Women and Saint Bernard of Clairvaux.
James Morison, The Life and Times of Saint Bernard: Abbot of Clairvaux, A.D. 1091-1153, reprint of an 1884 edition.
John R. Sommerfeldt, Bernard of Clairvaux on the Life of Mind.
John R. Sommerfeldt, Bernard of Clairvaux on the Spirituality of Relationship.
Richard Salter Storrs, Bernard of Clairvaux: the Times, the Man and His Work, originally published 1892.