Then look in the mirror, and repeat the scripture.
Do Roman Catholics use mirrors a lot? Part of the sideshow?
I know what those words of Christ mean. They mean there is no "alter Christus" nor is there any "co-redemptrix."
Men are justified by Christ on the cross alone which means salvation is unmerited, unearned and undeserved. No good works of men can warrant the free gift of grace. Therefore sinners are redeemed by God's grace alone through faith alone in Jesus Christ alone.
Those words do not "condemn;" they echo the word of God. They are truth and life.
There's only one reflection in that mirror -- Jesus Christ.