There are some Scriptural passages which seem to imply that God withdraws His grace from those who are obdurate, nay, that He Himself hardens their hearts in punishment of sin. Thus the Lord says of Pharao: “I shall harden his heart,”(536) and Moses tells us: “The Lord hardened Pharao’s heart, and he harkened not unto them.”(537) But it would be wrong to assume that this denotes a positive action on the part of God. Pharao, as we are told further on, “hardened his own heart” (_ingravavit cor suum_).(538) The fault in all cases lies with the sinner, who obstinately resists the call of grace. God’s co-operation in the matter is merely indirect. The greater and stronger graces which He grants to ordinary sinners, He withholds from the obdurate in punishment of their malice. This is, however, by no means tantamount to a withdrawal of sufficient grace.(539)
b) The Fathers speak of God’s way of dealing with obdurate sinners in a manner which clearly shows their belief that He never entirely withdraws His mercy. They insist that the light of grace is never extinguished in the present life. “God gave them over to a reprobate mind,” says St. Augustine, “for such is the blindness of the mind. Whosoever is given over thereunto, is shut out from the interior light of God: but not wholly as yet, whilst he is in this life. For there is ‘outer darkness,’ which is understood to belong rather to the day of judgment; that he should rather be wholly without God, whosoever, whilst there is time, refuses correction.”(540)
It follows that no sinner, how desperate soever his case may appear, need be despaired of. As long as there is life there is hope.(541) The Fathers consistently teach that the reason why reprobates are lost is not lack of grace but their own malice. Thus St. Chrysostom comments on Isaias’ prophecy regarding the impenitence of the Jews: “The reason they did not believe was not that Isaias had predicted their unbelief, but his prediction was based on the fact that they would not believe. They were unable to believe, _i.e._ they had not the will to believe.”(542)
c) The theological argument for our thesis is well stated by St. Thomas. He distinguishes between _obstinatio perfecta_ and _obstinatio imperfecta_ and says: Perfect obstinacy exists only in hell. Imperfect obstinacy is that of a sinner who has his will so firmly set on evil that he is incapable of any but the faintest impulses towards virtue, though even these are sufficient to prepare the way for grace.(543) “If any one falls into sin after having received Baptism,” says the Fourth Lateran Council, “he can always be restored by sincere penance.”(544) As the power of the keys comprises all sins, even those against the Holy Ghost, so divine grace is held out to all sinners. The Montanistic doctrine of the unforgivableness of the “three capital sins” (apostasy, murder, and adultery) was already condemned as heretical during the life-time of Tertullian. The sinner can obtain forgiveness only by receiving the sacrament of Penance or making an act of perfect contrition.(545) Justly, therefore, does the Church regard despair of God’s mercy as an additional grievous sin. If the rigorists were right in asserting that God in the end absolutely abandons the sinner, there could be no hope of forgiveness, and despair would be justified.