How do we know that salvation is by faith in Jesus alone?

In the sermon, it is emphasized that faith in Jesus is essential for salvation because it is through belief in Him that we receive everlasting life. John 5:24 articulates, 'He that hears My word and believes on Him that sent Me has everlasting life.' This indicates that salvation is not based on our works or merit but solely through faith in Christ. The gospel, as defined in 1 Corinthians 15:1-4, underscores that Christ died for our sins, was buried, and rose again. These key events affirm that Jesus is the central figure in our salvation, establishing the necessity of trusting in Him alone for redemption both from sin and eternal condemnation.