For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation.
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Ambrose of Milan
With these twin trumpets of heart and mouth we arrive at that holy land, viz., the grace of resurrection. So let them always sound together in harmony for us, that we may always hear the voice of God. Let the utterances of the angels and prophets arouse us and move us to hasten to higher things.
What Paul previously spoke about he now makes clear. The rule of faith is to believe that Jesus is Lord and not to be ashamed to confess that God raised him from the dead and has taken him up to heaven with his body, whence he will come again. Commentary on Paul’s Epistles.
We who expect to reign in everlasting righteousness can only be saved from this wicked world if while for our neighbor’s salvation we profess with our lips the faith which we carry about in our heart, we exercise a pious and careful vigilance to see that this faith in us is not sullied in any point of belief by the deceitful snares of heretics.
Did not almost all those who disowned Christ in the presence of their persecutors keep in their hearts what they believed about him? Yet, for not making with their mouth profession of faith unto salvation they perished, except those who repented and lived again.
"For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. Wherefore the Scripture saith, "Whosoever believeth on Him shah not be put to shame.".
But neither will this utterance be found to be spoken universally; for all the saved have confessed with the confession made by the voice, and departed.
This confession is followed by that which is partial, that before the authorities, if necessary, and reason dictate. For he will confess rightly with his voice who has first confessed by his disposition.
Wherefore the Scripture saith, Whosoever believeth on Him shall not be ashamed; that is, the word of faith which we preach: for if thou confess the word with thy mouth that Jesus is Lord, and believe in thy heart that God hath raised Him from the dead, thou shalt be saved."
It is better for a man to be silent and be a Christian than to talk and not be one…. Men believe with the heart and confess with the mouth, the one unto righteousness, the other unto salvation. It is good to teach, if the teacher also does what he says.
And Paul declares, "With the heart man believeth unto righteousness".
"And we know the quality of the hortatory addresses of carnal conveniences, how easy it is to say, "I must believe with my whole heart;
After explaining that confession on the lips and faith in the heart work salvation, the Apostle proves what he had said, setting out an example of this in two points which Moses seems to mention [n. 826], here he proves what he had said in the universal. And concerning this he does three things. First, he shows that by faith and confession of faith man obtains salvation; secondly, he lays down the order of salvation [v. 14; n. 835]; thirdly, he draws the conclusion [v. 17; n. 844]. 831. In regard to the first he does three things [n. 833, 834]. First, he presents his proposition, saying: I am correct in saying that if you confess with your lips and believe in your heart, you will be saved; for man believes with his heart and so is justified, i.e. he believes in order that he may obtain righteousness through faith: "Since we are justified through faith" (Rom 5:1). 415 Notice that he says man believes with his heart, i.e., his will, because man cannot believe, unless he wills. For the in...