but not double predestination.
There is no such thing as "double predestination." It's just pejorative term aimed at Calvinists.
Calvinists believe in predestination, that's all. The authoritative formulation of Calvinism is the
Canons of Dordt, part of which is quoted below. I invite Catholics to point out which parts of that contradict the
Summa of Thomas Aquinas.
1. As all men have sinned in Adam, lie under the curse, and are deserving of eternal death, God would have done no injustice by leaving them all to perish, and delivering them over to condemnation on account of sin, according to the words of the apostle, Romans 3:19, "
that every mouth may be stopped, and all the world may become guilty before God." And verse 23:"
for all have sinned, and come short of the glory of God." And Romans 6:23:"
for the wages of sin is death."
2. But in this the love of God was manifested, that he sent his only begotten Son into the world, that whosoever believeth on him should not perish, but have everlasting life. I John 4:9, John 3:16.
3. And that men may be brought to believe, God mercifully sends the messengers of these most joyful tidings, to whom he will and at what time he pleaseth; by whose ministry men are called to repentance and faith in Christ crucified. Romans 10:14-15:"
How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? And how shall they hear without a preacher? And how shall they preach except they be sent?"
4. The wrath of God abideth upon those who believe not this gospel. But such as receive it, and embrace Jesus the Savior by a true and living faith, are by him delivered from the wrath of God, and from destruction, and have the gift of eternal life conferred upon them.
5. The cause or guilt of this unbelief as well as of all other sins, is no wise in God, but in man himself; whereas faith in Jesus Christ, and salvation through him is the free gift of God, as it is written: "
By grace ye are saved through faith, and that not of yourselves, it is the gift of God," Ephesians 2:8. "
And unto you it is given in the behalf of Christ, not only to believe on him," etc. Philippians 1:29.
6. That some receive the gift of faith from God, and others do not receive it proceeds from God's eternal decree, "
For known unto God are all his works from the beginning of the world," Acts 15:18. "
Who worketh all things after the counsel of his will," Ephesians 1:11. According to which decree, he graciously softens the hearts of the elect, however obstinate, and inclines them to believe, while he leaves the non-elect in his just judgment to their own wickedness and obduracy. And herein is especially displayed the profound, and merciful, and at the same time the righteous discrimination between men, equally involved in ruin; or that decree of election and reprobation, revealed in the Word of God, which though men of perverse, impure and unstable minds wrest to their own destruction, yet to holy and pious souls affords unspeakable consolation.