Isaac of Stella - Sermons on the Christian Year Vol If the twelfth century, the world of the Schools, and the world of Citeaux was complimentary, not antagonistic. It is hard not to think that his theological studies had been a contributing factor in the search that led him to Citeaux; his sermons and treatises are evidence of the fact that his experience of the monastic life provided an ideal situation for theological meditation, while his duties as abbot saw to it that these meditations were