His fidelity to Aquinas likewise rendered him very bitter against Molinism; so much so, in fact, that he succeeded in persuading Gomarist Calvinists, as against the Arminians, to subscribe to the Thomistic doctrine of predestination and reprobation (ad sanam Thomistarum de predestinations et reprobatione doctrinam descenderunt, Proelect., vol. II, diss. 6, n. 242).