Jerome, Saint. [Letter to Marcella, 402?] in Sancti Eusebii Hieronymi Epistulae ep.97

[Letter from Jerome to Marcella]
Jerome sent his old friends, Pammachius and his cousin Marcella, a translation of one of Theophilus's three Paschal letters against Origenism, see ep.98. In the accompanying letter, Jerome sometimes addresses the heretics he is attacking directly, suggesting that the letter was written for a larger audience than his two friends.
Online at Epistolae (See also Bibliographia record).