26 And yet how great a thing it is, O Emperor, that you should not think it necessary to enquire or to punish in regard to a matter as to which up to this day no one has enquired, no one has ever inflicted punishment. It is a serious matter to endanger your salvation for the Jews. When Gideon had slain the sacred calf, the heathen said, The gods will themselves avenge the injury done to them. Who is to avenge the Synagogue? Christ, Whom they slew, Whom they denied? Will God the Father avenge those who do not receive the Father, since they have not received the Son? Who is to avenge the heresy of the Valentinians? How can your piety avenge them, seeing it has commanded them to be excluded, and denied them permission to meet together? If I set before you Josiah as a king approved of God, will you condemn that in them which was approved in him?
Source: Letters (New Advent)