Pray for the peace of Jerusalem: they shall prosper that love you.
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Augustine of Hippo
10. He at once addeth, as unto the seats themselves, "Enquire ye the things that are for the peace of Jerusalem" (ver. 6). O ye seats, who now sit unto judgment, and are made the seats of the Lord who judgeth (since they who judge, enquire; they who are judged, are enquired of), "Enquire ye," he saith, "the things that are for the peace of Jerusalem." What will they find by asking? That some have done deeds of charity, that others have not. Those whom they shall find to have done deeds of charity, they will summon them unto Jerusalem; for these deeds are "for the peace of Jerusalem." Love is a powerful thing, my brethren, love is a powerful thing. Do ye wish to see how powerful a thing love is? ...If charity be destitute of means, so that it cannot find what to bestow upon the poor, let it love: let it give "one cup of cold water;" as much shall be laid to its account, as to Zaccheus who gave half his patrimony to the poor.? Wherefore this? The one gave so little, the other so much, and shall so much be imputed to the former? Just so much. For though his resources are unequal, his charity is not unequal.
11 ..."And plenteousness," he addeth, "for them that love thee." He addresses Jerusalem herself, They have plenteousness who love her. Plenteousness after want: here they are destitute, there they are affluent; here they are weak, there they are strong; here they want, there they are rich. How have they become rich? Because they gave here what they received from God for a season, and received there what God will afterwards pay back for evermore. Here, my brethren, even rich men are poor. It is a good thing for a rich man to acknowledge himself poor: for if he think himself full, that is mere puffing, not plenteousness. Let him own himself empty, that he may be filled. What hath he? Gold. What hath he not yet? Everlasting life. Let him consider what he hath, and see what he hath not. Brethren, of that which he hath, let him give, that he may receive what he hath not; let him purchase out of that which he hath, that which he hath not, "and plenteoushess for them that love thee."