“A person becomes righteous by believing Gods record concerning His Son. But the evidence that this faith is genuine is found in the open confession of the Lord with the mouth. “Confession of Christ is as necessary as faith in Him, but necessary for a different purpose. Faith is necessary to obtain the gift of righteousness. Confession is necessary to prove that this gift is received.
“In saying, then, that confession is made unto salvation, the apostle does not mean that it is the cause of salvation, or that without it the title to salvation is incomplete. When a person believes in his heart, he is justified. But confession of Christ is in effect of faith, and will be evidence of it at the last day. Faith which interests the sinner in the righteousness of Christ is manifested by the confession of His name in the face of danger.”
- So Great Salvation, Charles Ryrie, Victor Books, 1989, pp. 70ff