Romans 10:16

Romans 10:16. But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?

So you see that even the prophet Isaiah had the idea that salvation comes to sinners by believing. He mourned and cried to his God because men did not believe the "report" which he had been sent to deliver to them concerning that Man who was "despised and rejected of men," that Man of whom the prophet truly said, "Surely he hath borne our griefs, and carried our sorrows: . . . . He was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed."