Confessions - pg. 18

As if, indeed, any man should feel that an enemy could be more destructive to him than that hatred with which he is excited against him, or that he could destroy more utterly him whom he persecutes than he destroys his own soul by his enmity. And of a truth, there is no scienceof letters more innate than the writing of conscience -- that he is doing unto another when he himself would not suffer. How mysterious art Thou, who in silence dwellest on high, Thou God, the only great, who by an unwearied law dealest out the punishment of blindness to illicit desires! When a man seeking for the reputation of eloquence stands before a human judge while a thronging multitude surrounds him, inveighs against his enemy with the fiercest hatred, he takes most vigilant heed that his tongue slips not into grammatical error, but takes no heed lest through the fury of his spirit he cut off a man from his fellow-men.