John Trapp on Proverbs 26:11

Verſ. 11. As a dogge returneth to his vomit] A homely compariſon (able to make a true Chriſtian ready to lay up all) but good enough for the odious Apoſtate, to whom it is applied. Such an one was Judas, Julian, Ecebolius, Baldvinus, Iſlebius, Agricola that firſt Antinomian, who did many times promiſe amendment, and yet afterwards fell to his errour again. After that, he condemned his errour, and recanted it in a publike Auditory, and printed his revocation; yet when Luther was dead, he relapſed into that errour; ſo hard a thing is it to get poyſon out, when once ſwallowed down. Harding (Biſhop Jewels Antagoniſt) was in King Edwards dayes, a thundering Preacher againſt Popery, wiſhing he could cry out againſt it as loud as the Bells of Oſeney: ſo that by his preaching many were confirmed in the truth. All which to be ſo, they can teſtifie that heard him, and be yet alive, ſaith Mr. Fox. See an excellent Letter of the Lady Jane Grays to him, whiles ſhe was Priſoner in the Tower, Act. & Mon. fol. 1291. wherein ſhe wills him to remember the horrible Hiſtory of Julian of old, and the lamentable caſe of Spira alate, &c.