Tertullian was the first to disprove charges that Christians sacrificed infants at the celebration of the Lord's Supper and committed incest. He pointed to the commission of such crimes in the pagan world and then proved by the testimony of Pliny the Younger that Christians pledged themselves not to commit murder, adultery, or other crimes. He adduced the inhumanity of pagan customs such as feeding the flesh of gladiators to beasts. He argued that the gods have no existence and thus there is no pagan religion against which Christians may offend. Christians do not engage in the foolish worship of the emperors, that they do better: they pray for them, and that Christians can afford to be put to torture and to death, and the more they are cast down the more they grow; "the blood of the martyrs is seed" ("Apologeticum", 50). In the "De Praescriptione" he develops as its fundamental idea that, in a dispute between the Church and a separating party, the whole burden of proof lies with the latter, as the Church, in possession of the unbroken tradition, is by its very existence a guarantee of its truth.