13 I, indeed, though a debtor to your kindness, for which I cannot be ungrateful, that kindness which has surpassed that of many emperors, and has been equalled by one only; I, I say, have no cause for a charge of contumacy against you, but have cause for fear; I dare not offer the sacrifice if you intend to be present. Is that which is not allowed after shedding the blood of one innocent person, allowed after shedding the blood of many? I do not think so.
Source: Letters (New Advent)