Fallen man cannot keep the law of himself
Thesis II. But man broke God's law of his own accord and lost the gifts and helps by which he had been able to keep it. He thus became the slave of sin, so that of himself he cannot satisfy the law fully in even a single work, or offer God an obedience that pleases him and that he accepts. Much less can he fulfil the law as anyone must who wants to reach life by the law.
Holy Scripture teaches this plainly enough. It says that people outside Christ's grace are dead in sins (margin: Eph. 2); that without him we can do nothing (margin: John 15); that we are not sufficient to think anything of ourselves, as if from ourselves (margin: 2 Cor. 3); and that the wisdom of the flesh is hostile to God, is not subject to God's law and cannot be (margin: Rom. 8).
Latin
II. Verum homo sponte legem Dei transgressus, amisit ea dona & auxilia per quae poterat legem Dei servare; & ita peccati servus effectus est, ut ex se, nequidem in uno opere, omni ex parte legi satisfacere possit, Deoque gratum & acceptum obsequium exhibere: tantum abest ut legem sic adimplere queat, ut necesse est ei qui per legem vult ad vitam pervenire. Quod Scriptura sacra satis aperte docet, dum affirmat [marg.: Eph. 2.] homines, extra Christi gratiam, in peccatis esse mortuos, & [marg.: Joan. 15.] nos sine illo nihil posse facere: neque [marg.: 2 Cor. 3.] sufficientes esse cogitare aliquid a nobis, quasi ex nobis: ac [marg.: Rom. 8.] sapientiam carnis inimicam esse Deo, & legi Dei subjectam non esse, neque se subjicere posse.