I was pondering over the first four verses in 1 John (1 John 1:1-4).
Jesus is what eternal life looks like (v. 2) as it is being lived. To bring others to the experience of Jesus is to complete the joy of faith (v. 4) and to taste eternal life now.
This kind of life is not jut a matter of duration, but a matter of quality and content. Life that goes on forever — is allowed to go on — has certain qualities like righteousness, compassion, justice and love. Lives of selfishness, malice, cruelty and hatred — that kind of life is not eternal but temporal, temporary. Moreover, it leads to eternal death.