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Collect: O God who hath created us, and more gloriously redeemed us, we thank you for your superabundant goodness, through Christ our Lord. Amen.
In the Sed Contra, St. Thomas provides Romans 8:30 for his dogmatic text, in his Commentary in Romans, he writes, "Predestination begins to be carried out with the calling of the person. This call is twofold: one is external and is made by the mouth of a preacher: she has sent out her maids to call from the highest places (Prov 9:3). In this way God called Peter and Andrew (Matt 4:18). The other call is internal and is nothing less than an impulse of the mind whereby a man’s heart is moved by God to assent to the things of faith or of virtue: who stirred up one from the east and called him to follow? (Isa 41:2)."
In the Respondeo, he begins by classifying justification within a genus, i.e., a movement, which is a change from one contrary to another. What specifies justification is that it is from sin to justice.