How do we know Jesus' offer of eternal life is true?

The truth of Jesus' offer of eternal life is grounded in His identity as the Son of God and the sufficiency of His sacrifice. In John 6:51, Jesus states, 'The bread that I will give is my flesh, which I will give for the life of the world.' This indicates that His flesh represents His sacrificial death, resulting in the atonement for sin. Moreover, the promise that He will raise believers up on the last day further underlines the assurance that His word is trustworthy. Believing that Jesus is the life-giving bread is therefore fundamental for attaining eternal life.