What Protestants do and do not deny
Thesis XXIX. Protestants never meant to deny any of this. They do not teach that God's law is simply impossible for the justified. They do not deny that believers give God's commandments true obedience, or that by Christ's grace the godly fulfil God's law to the extent of doing good works.
Nor do they say that the works by which believers, moved by the divine Spirit, try to conform themselves to the law must be called sins and are really sins by nature; they grant that such works can and should be called holy and righteous. The one thing they have always denied is that believers can fulfil the law perfectly, since their obedience, however true and sincere, always falls far short of the highest perfection.
Latin
XXIX. Verum nunquam fuit animus Protestantium quicquam horum negare. Non docent justificatis legem Dei esse plane impossibilem. Non inficiantur fideles veram Dei mandatis praestare obedientiam, & legem Dei per Christi gratiam sic a piis impleri, ut opera bona faciant. Nec dicunt opera, quibus divino spiritu movente legi se conformare student, appellanda esse peccata, & revera talia natura sua esse: sed fatentur illa posse & debere sancta & justa dici. Id solum ab ipsis est perpetuo negatum, a fidelibus legem impleri posse perfecte, quia illorum obedientia, quamvis vera & sincera sit, longe tamen a summa perfectione semper abest.