Quotes that Protestants and Catholics agree with:
“Similarly we also, who by His will have been called in Christ Jesus, are not justified by ourselves, or our own wisdom or understanding or godliness, nor by such deeds as we have done in holiness of heart, but by that faith through which Almighty God has justified all men since the beginning of time. Glory be to Him, forever and ever, Amen.”- St. Clement of Rome (? – ~101 AD) (Letter to the Corinthians, par. 32)”
Quotes Protestants do not agree with:
“Let us clothe ourselves with concord and humility, ever exercising self-control, standing far off from all whispering and evil-speaking, being justified by our works, and not our words.”
First Epistle of Clement to the Corinthians, Chapter 30.