"If thou do well, shalt thou not receive? but if ill, shall not sin forthwith be present at the door?
but the lust thereof shall be under thee, and thou shalt have dominion over it."Gen. 4:7
St. Augustine wrote:City of God, Book 15, Chpt. 7 Yet He does not dismiss him without counsel, holy, just, and good. “Fret not thyself,” He says, “for unto thee shall be his turning, and thou shall rule over him.” Over his brother, does He mean? Most certainly not.
Over what, then, but sin? For He had said, “Thou hast sinned,” and then He added, "Fret not thyself, for to thee shall be its turning, and thou shall rule over it." And the “turning” of sin to the man can be understood of his conviction that the guilt of sin can be laid at no other man’s door but his own. For
this is the health-giving medicine of penitence, and the fit plea for pardon; so that, when it is said, “To thee its turning,” we must not supply “shall be,” but we must read, “To thee let its turning be,” understanding it as a command, not as a prediction. For then shall a man rule over his sin when he does not prefer it to himself and defend it, but subjects it by repentance; otherwise he that becomes protector of it shall surely become its prisoner. But if we understand this sin to be that carnal concupiscence of which the apostle says, “The flesh lusteth against the spirit,” among the fruits of which lust he names envy, by which assuredly Cain was stung and excited to destroy his brother, then we may properly supply the words “shall be,” and read, “To thee shall be its turning, and thou shalt rule over it.” For when the carnal part which the apostle calls sin, in that place where he says, “It is not I who do it, but sin that dwelleth in me,” that part which the philosophers also call vicious, and which ought not to lead the mind, but which the mind ought to rule and restrain by reason from illicit motions –
when, then, this part has been moved to perpetrate any wickedness, if it be curbed and if it obey the word of the apostle, “Yield not your members instruments of unrighteousness unto sin,” it is turned towards the mind and subdued and conquered by it, so that reason rules over it as a subject.
Note the dominion over sin is in man, and that God is commanding, and not predicting. A man cannot repent over that which is not in control of his Will. We may regret, but we do not repent. God commands us to will righteousness. Note the sin is at each man’s door, the sin would not be at each man’s door if men did not will the sin to be there, and have dominion over sin so as to prevent the sin from being at his own door. The Will is in the Reason, and rules over its subject. The Subject the Reason rules is the lower order of the soul. The lower order is no longer under complete dominion, as in Adam, but is insubordinate and must be subdued and conquered. Does God subdue and conquer? No. It is man who subdues and conquers.
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The Church teaches
Predestination. What the Church does not teach is
Predestinarianism.
As St. Thomas writes on
Whether it is befitting that Christ should be predestinated?: “As is clear from what has been said in the FP, Question [23], Articles [1],2, predestination, in its proper sense, is a certain Divine preordination from eternity of those things which are to be done in time by the grace of God.”