““Your blood be on your own heads.” These words are obscure, but I think they mean this: Whoever does not believe in Christ, who is life, seems to kill himself by passing from life to death and shedding, as it were, his own blood through his self-inflicted death. Therefore he means that when you kill yourselves through disbelief, you receive the punishment of murder, so I am innocent. Following this train of thought it may be also said that he who kills himself is punished by God as a murderer. Similarly if a person is the reason why someone kills himself, he will be guilty in the same way."
- Ammonius of Alexandria (5th Century)