Whether man without grace can avoid sin?

Objections

Objection 1 : It would seem that without grace man can avoid sin. Because "no one sins in what he cannot avoid," as Augustine says (De Duab. Anim. x, xi; De Libero Arbit. iii, 18). Hence if a man in mortal sin cannot avoid sin, it would seem that in sinning he does not sin, which is impossible.
Objection 2 : Further, men are corrected that they may not sin. If therefore a man in mortal sin cannot avoid sin, correction would seem to be given to no purpose; which is absurd.
Objection 3 : Further, it is written (Ecclus. 15:18): "Before man is life and death, good and evil; that which he shall choose shall be given him." But by sinning no one ceases to be a man. Hence it is still in his power to choose good or evil; and thus man can avoid sin without grace.