By the second baptism, the Christian was also delivered from his own “demons” (earthly attachments) on an unconscious level.
To endure the second baptism, it was common for Christians to submit to horrific forms of torture in which they could lose their lives.
From this perspective, the deaths of Christian martyrs were probably not the result of the persecutions of Roman emperors.
[4] Cyprian of Carthage in a letter of 256 regarding the question of whether a catechumen seized and killed due to his belief in Jesus Christ "would lose the hope of salvation and the reward of confession, because he had not previously been born again of water", answers that "they certainly are not deprived of the sacrament of baptism who are baptized with the most glorious and greatest baptism of blood".
Citing the teaching of the early Church Fathers, Lutherans acknowledge a baptism of blood in "the circumstances of persecution".