Peter Damian. [Letter to Agnes of Poitiers, empress] in Die Briefe des Petrus Damiani 3.141-58

[Letter from Peter Damian to Agnes of Poitiers, empress.]
The letter is a treatise about the benefits of the spiritual life Agnes has chosen, and about her as a model for others. A translation of select passages and summary of the rest. Parts of this letter are included among Peter's biblical commentaries on 3 Kings, see PL145 c.116, 116-17, 120. The whole letter also appears as De fluxa mundi gloria et saeculi despectione, PL145, c.807-20.
Online at Epistolae (See also Bibliographia record).