Tradition
St. Cyprian
The Epistles of Cyprian
Letter 76
Cyprian to Nemesianus and Other Martyrs in the Mines.
Argument.— He Extols with Wonderful Commendations the Martyrs in the Mines, Opposing, in a Beautiful Antithesis, to the Tortures of Each, the Consolations of Each.
Source: The Epistles of Cyprian (New Advent)