How do we know that salvation is through faith in Jesus?

Romans 10:9-10 reveals the simplicity and profundity of salvation: 'if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.' This passage indicates that salvation hinges not on our works, but on faith in Christ's resurrection and acknowledgment of Him as Lord. The emphasis on believing with the heart underlines the transformative nature of faith, moving from mere intellectual assent to a heartfelt trust in Christ. Therefore, the assurance of salvation is anchored in our faith, not our performance.