This letter was sent at unknown date probably around the year 400, since this was the period when Paulinus was frequently visited by Victor from the monastery of Primuliacum (Gaul) who is Paulinus' source of information about Sebastianus. Sebastianus was, then, probably living in Gaul.
Although Paulinus compares here the life of the monk to the life of the deacon, this passus attests more broadly to the growing correspondence of monastic and clerical lifestyles.