During his twenty years as abbot of the Yorkshire monastery of Rievaulx, Aelred preached many sermons: to his own monks, in other monasteries, and at significant gatherings outside the cloister. In these thirty-one homilies on Isaiah chapters 13–16, together with an introductory Advent sermon, Aelred interprets the burdens that Isaiah prophesied against the nations according to their literal, allegorical, and moral senses. He sees these burdens as playing a role both in the history of the church and in the progress of the individual soul. This collection of homilies is an ambitious, unified work of a mature monk, synthesizing biblical exegesis, ascetical teaching, spiritual exhortation, and a theory of history.