As set out earlier, eternity is the infinity of God in relation to time. It is an attempt to set out that God does not have a beginning and will never have an end. The meaning of eternity and its being a necessary teaching for certain doctrines should bring thinking and loving human beings to worship.
The meaning for the doctrine of God is clear. Unless God is eternal, then He is not self-existent and some set of circumstances brought Him into being or some powerful being created Him. This teaching is utterly necessary for the biblical teaching of the character of God. This teaching is also necessary when we think of the true meaning of creation within the universe. God had to exist before the universe came into being or He would not be the One that created all that we know. So eternity is a necessary attribute of God for Him to be the Creator of all things.
Eternity is also a necessary teaching concerning the doctrine of Christ. In the Gospel of John 1:1-5 we see the clear declaration that Christ was the Word and that He was the Word from before the beginning. We also see that all things came into being through Him and nothing has come into being that did not come into being through Christ (1:3). The obvious implication of this is that Christ is an eternal being that never came into being. The eternal nature of God is necessary to the eternal nature of Christ and of His eternal kingdom.
Is Christ just a created being? If so, how could He satisfy the wrath of God for all those that will be saved? If Christ came into being at some point, then there is no way He could have satisfied the infinite wrath of God in the place of so many sinners. If Christ came into being at some point, then He is a created being and could not have had the infinite worth of an eternal and infinite being needed to suffer and satisfy the wrath of God. It is the eternal Son of God alone that can do what the blood of bulls and goats could not do (Heb 10:4) and “perfect for all time those who are sanctified” (Heb 10:14).
The eternal nature of God is necessary for the teaching of the plans of God. God planned salvation before the foundation of the world (Eph 1:4) and even prepared a kingdom for the saved from the foundation of the world (Mt 25:34). Christ was loved by the Father before the foundation of the world (John 17:24) and was foreknown before the foundation of the world but has appeared in these last times (I Peter 1:20). It is Christ who is called “eternal father” in Isaiah 9:6. There is no understanding of Christ and the Gospel (the eternal Gospel of Rev 14:6) without the biblical teaching of the eternal nature of God.
There is also the direct meaning for the doctrines of the next life. We are told over and over that those who believe in Christ have eternal life. We are told that those who die without Christ go into the eternal fire. We are told, in a different way, that those who enter heaven enter into eternal life. So what is clear from all the texts of Scripture that speak of these things is that the Gospel and heaven and hell depend on the nature of God being eternal. If God is not eternal, then hell will end some day. If heaven is not for eternity, then heaven will end someday. If the Gospel is all about eternal life, then the salvation wrought by Christ either brings eternal life or it does not. Christ Himself claimed to be the life (John 14:6) and John wrote that He came to bring understanding and know Him who is true and that Jesus Christ is the true God and eternal life (I John 5:20).
Matthew 18:8 – “If your hand or your foot causes you to stumble, cut it off and throw it from you; it is better for you to enter life crippled or lame, than to have two hands or two feet and be cast into the eternal fire.”
John 5:24 – “Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.”
With these verses in mind, it is hard to grasp these teachings of Scripture without coming to the realization that God is eternal and is life itself. Man whose life is but a vapor must bow before the God who has planned man’s existence and the boundaries of his life. Man must bow before this eternal God who alone can grant eternal life and who alone holds all things in His eternal hands.