For one who believes on the Son of God to doubt that he has eternal life is for him to make God a liar. “He that believeth on the Son of God hath the witness in him. He that believeth not God, hath made Him a liar because he hath not believed in the witness that God hath borne concerning His Son and the witness is this, that God gave unto us eternal life, and this life is in His Son. He that hath the Son hath the life: he that hath not the Son of God hath not the life” (1 John 5: 10-12, R. V.). Any one who does not believe God’s testimony that He has given unto us eternal life and that this life is in His Son and that he that hath the Son hath the life, makes God a liar.
It is sometimes said “it is presumption for any one to say that he knows he is saved, or to say that he knows that he has eternal life.” But is it presumption to believe God? Is it not rather presumption not to believe God, to make God a liar? When you who believe on the Son of God and yet doubt that you have eternal life, you make God a liar. When Jesus said to the woman who was a sinner, “Thy sins are forgiven” (Luke 7: 48), was it presumption for her to go out and say, “I know my sins are all forgiven”? Would it not have been presumption for her to have doubted for a moment that her sins were all forgiven? Jesus had said that they were forgiven. For her to doubt it would have been for her to give the lie to Jesus. Is it then any more presumption for the believer to-day to say, “My sins are all forgiven, I have eternal life,” when God says in His written testimony to every one that believeth, “You are justified from all things” (Acts 13: 39), “You have eternal life” (John 3: 36; 1 John 5: 13)?
Be very sure first of all that you really do believe on the name of the Son of God; that you really have received Jesus. If you are sure of this then never doubt for a moment that your sins are all forgiven, never doubt for a moment that you are a child of God, never doubt for a moment that you have everlasting life. If Satan comes and whispers, “Your sins are not forgiven,” point Satan to the Word of God and say, “God says my sins are forgiven and I know they are.” If Satan whispers, “Well perhaps you don’t believe on Him,” then say, “Well if I never did before I will now.” And then go out rejoicing, knowing that your sins are forgiven, knowing that you are a child of God, knowing that you have everlasting life.
There are doubtless many who say they know they have eternal life who really do not believe on the name of the Son of God, who have not really received Jesus. This is not true assurance. It has no sure foundation in the Word of God who cannot lie. If we wish to get assurance of salvation we must first get saved. The reason why many have not the assurance that they are saved is because they are not saved. They ought not to have assurance. What they need first is salvation. But if you have received Jesus in the way described in the first chapter, YOU ARE SAVED, you are a child of God, your sins are forgiven. Believe it, know it. Rejoice in it.
Having settled it, let it remain settled. Never doubt it. You may make mistakes, you may stumble, you may fall, but even if you do, if you have really received Jesus, know that your sins are forgiven and rise from your fall and go forward in the glad assurance that there is nothing between you and God.