That is, every one who uses the sword. And he uses the sword, who, without the command or sanction of any superior, or legitimate authority, arms himself against man’s life. For truly the Lord had given commandment to His disciples to take the sword, but not to smite with the sword. Was it then at all unbeseeming that Peter after this sin should become ruler of the Church, as Moses after smiting the Egyptian was made ruler and chief of the Synagogue? For both transgressed the rule not through hardened ferocity, but through a warmth of spirit capable of good; both through hatred of the injustice of others; both sinned through love, the one for his brother, the other for his Lord, though a carnal love.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: cont. Faust., xxii, 70