How do we know that Jesus has the authority to give eternal life?

In John 5:19-21, Jesus asserts His unique relationship with the Father, indicating that the Son can do nothing of Himself but only what He sees the Father do. Jesus has been given the authority to give life to whomever He wills, which underscores His sovereignty and divine prerogative. This claim is backed by His miraculous signs, such as healing the invalid in John 5, showcasing His power over death and disease. Furthermore, John 5:22 indicates that judgment has been entrusted to the Son, affirming that all men should honor Him just as they honor the Father. This confers a significant theological weight on Christ's ability to grant eternal life to believers.