Letter to Dracontius. Written a.d. 354 or 355.
I am at a loss how to write. Am I to blame you for your refusal? Or for having regard to the trials, and hiding for fear of the Jews? In any case, however it may be, what you have done is worthy of blame, beloved Dracontius. For it was not fitting that after receiving the grace you should hide, nor that, being a wise man, you should furnish others with a pretext for flight. For many are offended when they hear it; not merely that you have done this, but that you have done it having regard to the times and to the afflictions which are weighing upon the Church. And I fear lest, in flying for your own sake, you prove to be in peril in the sight of the Lord on account of others. For if 'he that offends one of the little ones, should rather choose that a mill stone were hanged about his neck, and that he were drowned in the depths of the sea,' what can be in store for you, if you prove an offense to so many? For the surprising unanimity about your election in the district of Alexandria will of necessity be broken up by your retirement: and the episcopate of the district will be grasped at by many—and many unfit persons, as you are well aware. And many heathen who were promising to become Christians upon your election will remain heathen, if your piety sets at nought the grace given you.
Source: Letters (New Advent)