 There is an English translation of De divina omnipotentia (Letter 119) in Peter Damian, Letters 91–120, tr. O.J. Blum (The Fathers of the Church. Mediaeval Continuation 5), Washington, DC: Catholic University of America Press 1998, 344–386. (Unfortunately, there are mistakes in the translation of some passages of Damian’s treatise which are crucial to its understanding. See the  Supplement Document.)