Some Protestants and Catholics misrepresent the doctrine of justification by faith as some entirely novel invention of Martin Luther. This is said by Roman Catholics to imply that no one before him had ever had the audacity or pure evil intentions to declare such a thing. And it is said by some non-Catholics to dismiss the church pre-1500 as irrelevant and to dismiss the idea of tradition having any proper role in aiding exegesis. But what if part of your exegesis of Scripture had to answer this question: "Has anyone before 1800, or 1500, ever interpreted this passage this way? If not, what do you have access to that they don't that would inform such a difference in interpretation?" Certainly, the doctrine of justification by faith in Luther and Calvin is more developed, but it is not novel:
"All effort of human argument must be postponed where faith alone is sufficient...the righteousness of faith, by which we are justified [consists in] that we believe in him whom we do not see, and that, being cleansed by faith, we shall eventually see him in whom we now believe." -Julian of Toledo, Bishop of Toledo (circa 7th Cent)
"[Justification is] thou art not only righteous, but art called 'righteous' a righteousness that justifies...The righteousness of God consists in his not sinning, but the righteousness of man consists in his being forgiven by God." -Bernard of Clairvaux, Catholic mystic (circa 14th Cent)
"God who does make the unclean clean and who by taking away sins does justify the sinner without works." -Ildefonsus of Toledo, Bishop of Toledo (circa 7th Cent)
"The beginning of human salvation comes from faith...which when it is in Christ, is justification to the believer." -Hincmar of Reims, Bishop of Reims (circa 9th Cent)
"We, too, being called by His will in Christ Jesus, are not justified by ourselves, nor by our own wisdom, or understanding, or godliness, or works which we have wrought in holiness of heart; but by that faith through which, from the beginning, Almighty God has justified all men; to Whom be glory for ever and ever, Amen" -Clement of Rome, presbyter/bishop? of Rome (circa 1st Cent)
"A man is justified by faith. The works of the law can make no contribution to this. Where there is no faith which might justify the believer, even if there are work of the law these are not based on hte foundation of faith. Even if they are good in themselves they cannot justify the one who does them, because faith is lacking, and faith is the mark of those who are justified by God." -Origen, early church theologian (circa 3rd Cent)
"No one has been so foolish as to say that merits are the cause of the divine act by which God predestines...There would indeed be injustice if the effects of predestination were rendered as a debt which is due, and not given by grace." -Thomas Aquinas, Latin Theologian (circa 13th Century) *
"We believe that man is justified by faith, not by works...we understand the correlative of faith, namely the righteousness of Christ, which faith, performing the function of a hand, grasps and applies to us salvation." -Patriarch of Constantinople Cyril Lucaris, Greek Orthodox's highest bishop (circa 17th Cent.)
"no one, [Paul] saith, is justified by works, in order that the grace and loving-kindness of God may be shown. He did not reject us as having works, but as abandoned of works He hath saved us by grace; so that no man henceforth may have whereof to boast...the whole work is accomplished not of works but by faith." -John Chysostom, Greek preacher (circa 4th Cent)
*[Update: I do realize Thomas has an Augustinian idea of justification as "making righteous" but included him because the statement by itself without the identifier would be most often identified as sounding Lutheran/Reformed rather than Thomistic. Hence the title "Guess the heretic." This is only meant to show the seeds, not the full fruit of justification. The same premises that lead Thomas to his doctrine of presdestination lead Luther to his doctrine of justification. I mean no more.]