13. Thus, also, when He gave the law of prayer, He added, saying, “And when ye stand praying, forgive, if ye have ought against any; that your Father also which is in heaven may forgive you your trespasses.”39 Mark xi. 25. [Freeman, Principles, etc. vol. i. 417.] And He calls back from the altar one who comes to the sacrifice in strife, and bids him first agree with his brother, and then return with peace and offer his gift to God: for God had not respect unto Cain’s offerings; for he could not have God at peace with him, who through envious discord had not peace with his brother. What peace, then, do the enemies of the brethren promise to themselves? What sacrifices do those who are rivals of the priests think that they celebrate? Do they deem that they have Christ with them when they are collected together, who are gathered together outside the Church of Christ?
XIII. Ideo et cum orandi legem daret, addidit dicens: Et cum steteritis ad orationem, remittite si quid 0510A habetis adversus aliquem, ut et Pater vester qui in coelis est remittat vobis peccata (Marc. XI, 25). Et ad sacrificium cum dissensione venientem revocat ab altari, et jubet prius concordare cum fratre, tunc cum pace redeuntem Deo munus offerre (Matth. V, 24), quia nec ad Cain munera respexit Deus (Gen. IV, 5): neque enim pacatum habere Deum poterat, qui cum fratre pacem per zeli discordiam non habebat. Quam sibi igitur pacem promittunt inimici fratrum, quae sacrificia celebrare se credunt aemuli sacerdotum? An secum esse Christum cum collecti fuerint opinantur, qui extra Christi Ecclesiam colliguntur?