How do we know that life only comes from Jesus?

In 1 John 5:11-12, it is declared, 'And this is the record, that God hath given to us eternal life, and this life is in his Son. He that hath the Son hath life; and he that hath not the Son of God hath not life.' This scripture emphasizes that eternal life is intrinsically linked to a relationship with Jesus. His role as the life sustainer and giver of salvation is central to Christian belief; without Him, one cannot possess true life or eternal hope. The covenant God made with Christ ensures that through Him, believers are granted not only existence but a life abundant in grace and truth.