Dr. Peter S. Ruckman in contrast to Ambrosiaster on Romans 10:9

“And here it comes: the simplest, clearest presentation of salvation found anywhere in either Testament. Two conditions: If. ‘If thou shalt confess with thy mouth the Lord Jesus,’ number two, ‘And shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.’ No ifs, ands, buts about it. And notice the heart is not changed. The heart believes on Christ in its regular condition. There is no overpowering of the sinner by the irresistible grace of God, which transforms him against his will into a new creature so he can receive Christ, and all that Calvinistic baloney. It’s saying that an unsaved man in his natural condition, and he’s told, if you believe something in your heart and confess it with your mouth, God’ll give you the new birth, God’ll save you and impute to you righteousness and justify you." - Dr. Peter S. Ruckman, Romans 10:9

“Because if you confess the Lord Jesus with your mouth and believe in your heart that God raised him from the dead, you will be saved. 10:10 For one believes with the heart unto righteousness, but confession is made with the mouth unto salvation. Everything the apostle discussed above he has stated clearly here, namely, that this is the rule of faith: to believe that Jesus is Lord and not to be ashamed to profess that God raised him from the dead and led him in bodily form17 into heaven, from which he had come to be in an incarnate form.18 With this rule of faith one is preserved from the censure of the gospel: Many of the rulers believed in Jesus, but they did not profess this openly on account of the Jews; for they preferred the praise of

people to the praise of God (John 12:42–43)." - Ambrosiaster, Romans 10:9

Notice Ambrosiaster views it as a profession (not a confession), and Dr. Peter S. Ruckman views it as a private confession to God.