Serlo was Abbot of Savigny in Normandy from 1139 to 1153 when he retired to Clairvaux; he died in 1158. He was a contemporary and admirer of StBernard; and it was no doubt largely owing to St Bernard's influence that in 1147 Serb submitted the whole group of Savigniac houses to the Cistercian Order. Among these were several in England, including Buckfast and Quarr. Serb had a reputation as a preacher. Of his thirty-four sermons known to survive—not all of them, however, are complete—the greater part were included in the sixth volume of the Bibliotheca patrum Cisterciensium, edited by Tissier in 1664. The rest remain apparently still in manuscript. An exception is that translated here, which was published by Dom Wilmart in the Revue Mabillon, tome XII (1922), pp. 26-3 8. The following is a rather free rendering of the Latin. A third section on prayer seems to be wanting. Perhaps time ran out and it was never delivered.