“Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent. I have brought you glory on earth by finishing the work you gave me to do.” (John 17:3–4, NIV)
This is eternal life: knowing God and Jesus Christ.
Jesus came into the world to give the world this message. Without him, there is no hope of personal salvation. Those who accept this truth will enjoy a life that will echo into eternity.