How do we know that Christ is the source of everlasting life?

Christ Himself, as highlighted in John 6:27-29, states that He is the one who offers 'meat which endureth unto everlasting life.' This assurance is rooted in the covenantal nature of God's promises, where Christ is sealed by the Father for this very purpose. Our belief in Him is not based on mere feelings or experiences but is anchored in the divine truth He reveals through His Word. Furthermore, in Ephesians 1, we learn that upon believing in Christ, we are sealed with the Holy Spirit—a mark of assurance that confirms our salvation and eternal life through Him.