How do we know faith in Christ is sufficient?

Faith in Christ is presented in Scripture as the sole means to eternal life, highlighted in John 20:31, which declares that believing in Jesus as the Christ gives life through His name. This faith is not based on signs or miracles but is granted by God. The sermon illustrates this through the example of John the Baptist, who, while in prison, did not ask for signs but rather for confirmation of Christ's identity. Thus, faith, as a divinely given gift, provides assurance of salvation that is independent of physical evidence.