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Thomas Aquinas taught that faith alone saves, two centuries before Martin Luther.
Wait. Read that again.
Aquinas didn't teach sola fide. He taught something far more precise, and his precision is exactly why Luther's formulation fails.
In the Summa Theologiae (I-II, Q. 109), Aquinas asks whether faith alone is sufficient for salvation. His answer: no. Not because faith doesn't matter, but because faith divorced from charity is a dead thing. It is "unformed faith," fides informis, which even demons possess.
The real category is fides caritate formata. Faith formed by charity. Faith that is alive because grace has actually transformed the soul from within.
This is the key distinction Protestants often miss.
Luther treated justification as a legal declaration. God pronounces you righteous while you remain, in Luther's own words, "simul justus et peccator," simultaneously just and a sinner. The righteousness stays outside you, imputed but not infused.
Aquinas saw something different in Scripture. Romans 5:5: "The love of God has been poured into our hearts through the Holy Spirit." Not credited to our account. Poured in.
Infused grace actually changes you. The theological virtues, including faith, are real habits of the soul, not legal fictions.
So when Trent defined justification against Luther in Session VI, it wasn't inventing new theology. It was defending Aquinas. And Aquinas was defending Paul.
The debate was never faith vs. works. It was always: does grace transform you, or merely cover you?
Which answer does Romans 5:5 actually support?
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