Tradition
St. Cyprian
The Epistles of Cyprian
Letter 25
Moyses, Maximus, Nicostratus, and the Other Confessors Answer the Foregoing Letter. A.D. 250.
Argument.— They Gratefully Acknowledge the Consolation Which the Roman Confessors Had Received from Cyprian's Letter. Martyrdom is Not a Punishment, But a Happiness. The Words of the Gospel are Brands to Inflame Faith. In the Case of the Lapsed, the Judgment of Cyprian is Acquiesced in.
Source: The Epistles of Cyprian (New Advent)