What Paul means by justification by faith, not by works
Paul's contrast: not legal-covenant perfect observance, but sincere gospel faith with its obedience.
God freely remits and counts just those who receive the gospel from the heart.
Latin
XXXV. Quoties ergo affirmat Apostolus nos non justificari operibus, sed fide, non aliud docere intendit, quam nullum omnino justificari posse per observationem legis, quam foedus legale postulat, ut per illud vitam habeamus, & vitemus Dei maledictionem: sed Deum pro justis habere, ac remissionem peccatorum omnium ex mera sua gratia donare, omnes illos qui corde syncero Evangelium suscipiunt, illique veram ex fide praestant obedientiam.