Whether man without grace and by his own natural powers can fulfil the commandments of the Law?

Objections

Objection 1 : It would seem that man without grace, and by his own natural powers, can fulfil the commandments of the Law. For the Apostle says (Rm. 2:14) that "the Gentiles who have not the law, do by nature those things that are of the Law." Now what a man does naturally he can do of himself without grace. Hence a man can fulfil the commandments of the Law without grace.
Objection 2 : Further, Jerome says (Expos. Cathol. Fide [*Symboli Explanatio ad Damasum, among the supposititious works of St. Jerome: now ascribed to Pelagius]) that "they are anathema who say God has laid impossibilities upon man." Now what a man cannot fulfil by himself is impossible to him. Therefore a man can fulfil all the commandments of himself.
Objection 3 : Further, of all the commandments of the Law, the greatest is this, "Thou shalt love the Lord thy God with thy whole heart" (Mt. 27:37). Now man with his natural endowments can fulfil this command by loving God above all things, as stated above (Article [3]). Therefore man can fulfil all the commandments of the Law without grace.