b) A pertinent question, closely allied to the proposition just treated, is this: Can the human will, without the aid of grace, overcome all the grievous temptations to mortal sin by which it is besieged?
It is the common teaching of theologians that, without the aid of grace, man in the fallen state succumbs with moral (not physical) necessity to grievous temptations against the moral law, _i.e._ to mortal sin. This conclusion flows from the impossibility, which we have demonstrated above, of observing the whole law of nature for life or for any considerable length of time without the help of grace. If man were able to resist all violent temptations, he would be able to keep the whole law.
The theological teaching which we are here expounding may be formulated in two different ways: (1) No man can overcome all grievous temptations against the moral law without the aid of grace; (2) there is no man living who is not now and then assailed by temptations to which he would inevitably succumb did not God lend him His assistance.
In its first and rather indefinite form the proposition is attacked by Ripalda,(179) Molina,(180) and many later Scholastics. These writers argue as follows: It is impossible to deduce from Revelation or experience a definite rule by which man could determine the conditions on which the grievousness of a temptation depends. To say that a temptation is grievous when it cannot be resisted without the aid of grace, would be begging the question. Besides, the possibility always remains that there be men who, though in theory unable to withstand all grievous temptations without the aid of grace, _de facto_ never meet with such temptations, but only with the lighter kind which can be overcome without supernatural help.
The second and more specific formulation of our proposition is supported by Sacred Scripture, which explicitly declares that all men are subject to temptations which they could not resist if God did not uphold them.(181)
If the just are obliged to watch and pray constantly, lest they fall,(182) this must be true in an even higher degree of sinners and unbelievers. St. Augustine writes against the Pelagians: “Faithful men say in their prayer: ‘Lead us not into temptation.’ But if they have the capacity [of avoiding evil], why do they pray [for it]? Or, what is the evil which they pray to be delivered from, but, above all else, the body of this death?... the carnal lusts, whence a man is liberated only by the grace of the Saviour.... He may be permitted to pray that he may be healed. Why does he presume so strongly on the capability of his nature? It is wounded, hurt, harassed, destroyed; what it stands in need of is a true confession [of its weakness], not a false defense [of its capacity].”(183)