Whoever says “I know him” but does not keep his commandments is a liar, and the truth is not in him, but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him: whoever says he abides in him
ought to walk in the same way in which he walked. (1 John 2:4-6 ESV)
It is possible to both calm trembling hearts and shock proud hearts with the truth of God’s Word. There are those who are really in Christ who are not yet resting in the peace of Christ. There are also those whose arrogance has duped them into thinking that they’re set—practically in heaven itself—and there’s nothing to worry about.
1 John speaks to both groups of church goers. The evidence is conclusive and undeniable. A life of growing love of and obedience to Jesus Christ demonstrates that the one professing faith in Christ has actually experienced the new birth brought about by the Holy Spirit. The apostle John wrote his first epistle to comfort and strengthen the saints of God with this truth.
This letter however, also serves as a wakeup call to the fake / fool who attempts to deceive others masquerading as a of God. If he is not keeping the commandment of loving God with all his heart, soul, mind and strength (and loving his neighbor as himself), he has nothing to do with Christ and stands in opposition to the Lord, His gospel and church. This is a dangerous spot to be in because the Sunday charade actually hardens the heart and makes it more and more difficult to humbly turn in repentance and seek the Lord’s salvation.
Assurance of salvation is founded on the promises and character of God, the completed work of salvation achieved through the cross of Jesus Christ and manifested through the fruit of the Spirit. It is a sweet blessing to know the guarantee of salvation. It’s more than just an intellectual assent to being eternally secure. Biblical assurance is confidence in God’s promise that He who began a good work in you will bring it to completion at the day of Jesus
Christ (Philippians 1:6). Has the gospel taken you from death to life? If you’re not sure, don’t wait another day.