Aelred of Rievaulx (1110-1167) lived most of his youth in the court of King of Scotland. He studied and lived in friendship with those around him. However, in 1133, he entered the Abbey of Rievaulx, near York, Cistercian of obedience, a subsidiary of the Abbey of Clairvaux. After holding the office of Master of Novices, he rose to the abbacy of Reversby, daughter house of Rievaulx in Lincolnshire, before returning to Rievaulx in 1146. Aelred is considered one of the most important representatives of monastic spirituality of the twelfth century. With Bernard of Clairvaux, William of St. Thierry and Guerric Igny it is one of those writers who are the 'first generation' of Cistercian spiritual writers. He wrote many historical writings, poetic and religious. His works are based on a spirituality of personal high sensitivity in which human friendship leads to love of God. The work of gathering and ordering of different parts of the corpus homiletic Aelred, undertaken by the brother Gaëtan Raciti (Orval Abbey in Belgium), which are derived from three previous volumes of the Opera Omnia of the author (CC CM 2A, 2B and 2D), ends at this by editing the collection of 98 sermons of Reading, almost all unpublished and transmitted by a single manuscript preserved in Paris today, the ms. BnF, New. acq. lat. 294