Whether anyone without grace can merit eternal life?

Objections

Objection 1 : It would seem that without grace anyone can merit eternal life. For man merits from God what he is divinely ordained to, as stated above (Article [1]). Now man by his nature is ordained to beatitude as his end; hence, too, he naturally wishes to be blessed. Hence man by his natural endowments and without grace can merit beatitude which is eternal life.
Objection 2 : Further, the less a work is due, the more meritorious it is. Now, less due is that work which is done by one who has received fewer benefits. Hence, since he who has only natural endowments has received fewer gifts from God, than he who has gratuitous gifts as well as nature, it would seem that his works are more meritorious with God. And thus if he who has grace can merit eternal life to some extent, much more may he who has no grace.
Objection 3 : Further, God's mercy and liberality infinitely surpass human mercy and liberality. Now a man may merit from another, even though he has not hitherto had his grace. Much more, therefore, would it seem that a man without grace may merit eternal life.