E4Cap15
Chapter — Part IV
Latin
Quæ concordiam gignunt sunt illa quæ ad justitiam, æquitatem et honestatem referuntur. Nam homines præter id quod injustum et iniquum est, etiam ægre ferunt quod turpe habetur sive quod aliquis receptos civitatis mores aspernatur. Amori autem conciliando illa apprime necessaria sunt quæ ad religionem et pietatem spectant. De quibus vide scholia I et II propositionis 37 et scholium propositionis 46 et scholium propositionis 73 partis IV.
English (Elwes 1883)
Those things, which beget harmony, are such as are attributable to justice, equity, and honourable living. For men brook ill not only what is unjust or iniquitous, but also what is reckoned disgraceful, or that a man should slight the received customs of their society. For winning love those qualities are especially necessary which have regard to religion and piety (cf. IV. xxxvii. notes. i. ii.; xlvi. note; and lxxiii. note).
Modern English
What produces harmony belongs to justice, fairness, and honourable conduct. For people take offense not only at what is unjust and inequitable but also at what is considered disgraceful, or at anyone who scorns the accepted customs of their society. To win love, what matters most is what bears on religion and piety — see the First and Second Scholia to Proposition 37, the Scholium to Proposition 46, and the Scholium to Proposition 73 of Part IV (E4P37S1).