12 Let such gains as these be far from the purity of your treasury. Let the revenue of good princes be increased not by the losses of priests, but by the spoils of enemies. Does any gain compensate for the odium? And because no charge of avarice falls upon your characters, they are the more wretched whose ancient revenues are diminished. For under emperors who abstain from what belongs to others, and resist avarice, that which does not move the desire of him who takes it, is taken solely to injure the loser.
Source: Memorial of Symmachus (New Advent)