Eternal life is not simply life that never ends, but a fullness of life that is unending. In fact, in many ways, eternal life really has nothing to do with time as it can be experienced apart from time as well as within time. The Bible tells us that everyone will exist eternally—it is the quality of that existence that separates us.
Eternal life is a free gift of God to those who believe in Jesus Christ. Eternal life begins when we put our faith in Jesus. As believers in Christ, eternal life continues with God after our physical death. Eternal life is the quality of life that results when we know Jesus Christ by experience, on a first-hand basis.
For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.