Roman doctors admit it: Stapleton
Thesis XL. That this is so, and that believers in this corrupt and weak state of nature cannot rise to the perfection just described, is so plain from experience itself, from the common sense of believers and the inner witness of conscience, that the doctors of the Roman Church themselves neither can nor dare deny it. On this point they are forced to yield to the truth.
Stapleton alone is ample proof. He was a man of no small authority among his own, a fierce enemy of the Protestants and a defender of papal doctrine, who to the great applause of his party wrote twelve whole books on justification and related questions and gave the entire sixth book to the present question of fulfilling the law. To make this clearer, it seems right to summarize briefly here what that doctor sets out at length in that book.
Latin
XL. Rem vero ita se habere, neque fideles in hac naturae corruptione atque infirmitate, posse ad modo descriptam perfectionem assurgere, res est ipsa experientia, & communi fidelium sensu, ac interno conscientiae testimonio tam evidens, ut eam negare nec possint, nec ausint ipsi Doctores Ecclesiae Romanae: sed hac in parte cogantur veritati dare manus. Cujus rei fidem abunde facere potest vel unus Stapletonus, vir inter suos non parvae authoritatis, idemque acerrimus Protestantium hostis, ac Pontificiae doctrinae defensor, qui magno cum suorum applausu, libros integros duodecim scripsit de justificatione, & quaestionibus annexis, totumque librum sextum insumpsit in pertractanda praesenti quaestione de impletione legis. Atque ut istud clarius pateat, breviter hic in summam redigere visum est quae Doctor ille dicto libro prolixe edisserit.