When the Bible speaks of eternal life, it refers to a gift of God that comes only “through Jesus Christ our Lord” (Romans 6:23). This gift is in contrast to the “death” that is the natural result of sin.
The gift of eternal life comes to those who believe in Jesus Christ, who is Himself “the resurrection and the life” (John 11:25). The fact that this life is “eternal” indicates that it is perpetual life—it goes on and on and on, with no end.
It is a mistake, however, to view eternal life as simply an unending progression of years. A common New Testament word for “eternal” is aiónios, which carries the idea of quality as well as quantity. In fact, eternal life is not really associated with “years” at all, as it is independent of time. Eternal life can function outside of and beyond time, as well as within time.
For this reason, eternal life can be thought of as something that Christians experience now. Believers don’t have to “wait” for eternal life, because it’s not something that starts when they die. Rather, eternal life begins the moment a person exercises faith in Christ. It is our current possession. John 3:36 says, “Whoever believes in the Son has eternal life.” Note that the believer “has” (present tense) this life (the verb is present tense in the Greek, too). We find similar present-tense constructions in John 5:24 and John 6:47. The focus of eternal life is not on our future, but on our current standing in Christ.
The Bible inextricably links eternal life with the Person of Jesus Christ. John 17:3 is an important passage in this regard, as Jesus prays, “Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent.” Here, Jesus equates “eternal life” with a knowledge of God and of the Son. There is no knowledge of God without the Son, for it is through the Son that the Father reveals Himself to the elect (John 17:6; 14:9).