15 And that the proof might not be the less substantial, and the confession of Christ might not be a matter of pleasure, they are tried by tortures, by crucifixions, by many kinds of punishments. Pain, which is the test of truth, is brought to bear, that Christ the Son of God, who is trusted in as given to men for their life, might not only be announced by the heralding of the voice, but by the testimony of suffering. Therefore we accompany Him, we follow Him, we have Him as the Guide of our way, the Source of light, the Author of salvation, promising as well the Father as heaven to those who seek and believe. What Christ is, we Christians shall be, if we imitate Christ.
Source: The Treatises of Cyprian (New Advent)