Can Assurance Be Lost?
God says…
I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel, which is not another; but there are some who trouble you and want to pervert the gospel of Christ.
The Letter of Paul to the Galatians
Chapter 1, Verses 6-7
Stand fast therefore in the liberty by which Christ has made us free, and do not be
entangled again with the yoke of bondage.
The Letter of Paul to the Galatians
Chapter 5, Verse 1
That means…
Yes, assurance can be lost. While eternal life can’t be lost, assurance can. Whenever a believer stops looking to Christ for assurance, he will lose assurance of his salvation. The believers in Galatia were confronted by false teachers. The false teachers told them that they had to keep the Law of Moses in order to be saved. The result was that some of the believers in Galatia lost the assurance that they were saved.
A person is saved the very moment he believes in Christ for eternal life. At that moment, he knows for sure that he has eternal life and that he can never lose it. However, that does not mean that all Christians always have assurance of salvation. If a Christian takes his eyes off Christ, then he will lose his assurance. Each day you must believe Christ’s promise to you in order to stay sure that you have eternal life.
If you lose your faith, you will also lose your assurance. Therefore you need to cultivate your faith in order to keep your assurance. "Avoid truth decay: Read your Bible every day" is a slogan that is true of all aspects of the Christian life, including assurance of salvation.