John Trapp on Proverbs 18:19

Verſ. 19. A brother offended is harder to bee won, &c.] Whether it bee a brother by race, place, or grace; Corruptio optimi peſſima: Thoſe oft that loved moſt dearly (if once the Devil caſt his club betwixt them) they hate moſt deadly. See this exemplified in Cain and Abel, Eſau and Jacob, Polynices and Eteocles, Romulus and Remus, Caracalla and Geta, the two ſons of Severus the Emperour, Robert and Rufus the ſons of William the Conquerour, the Civil diſſentions between the houſes of York, and Lancaſter (wherein were ſlain eighty Princes of the blood-royal) the diſſentions between England and Scotland, Daniel. 192. which conſumed more Chriſtian-blood, wrought more ſpoil and deſtruction, and continued longer than ever quarrel wee read of did between any two people of the world. As for Brethren by profeſſion (and that of the true Religion too) among Proteſtants, you ſhall meet with many diviſions, and thoſe proſecuted with a great deal of bitterneſſe.Eucholcer. Nullum bellum citius exardeſcit, nullum deflagrat tardius quàm Theologicum. No war breaks out ſooner, or laſts longer, than that among Divines, or as that about the Sacrament; a Sacrament of love, a Communion, and yet the occaſion (by accident) of much diſſention.Melch. Adam in vita. This made holy Strigelius weary of his life. Cupio ex hac vita migrare ob duas cauſas, ſaith hee. For two cauſes chiefly do I deſire to depart out of this world; Firſt, That I may injoy the ſweet ſight of the Son of God, and the Church above; Next, Ut liberer ab immanibus & implicabilibus odiis Theologorum, that I may bee delivered from the cruel and implacable hatreds of diſſenting Divines. There is a moſt ſad ſtory of thoſe that fled to Frankford hence in Queen Maries time; yet among them there were ſuch grievous breaches, that they ſought the lives one of another; Great care therefore muſt bee taken, that brethren break not friendſhip: Or if they do, that they re-unite and peece again as ſoon as is poſſible.