One of the most common struggles a new believer faces is doubt about their own salvation. The enemy whispers questions: Was it real? Did anything actually change? Am I truly saved? These doubts are not unusual, but they are not from God. The Bible was written, in part, specifically to give believers settled assurance.
The Apostle John, writing to believers, stated his purpose directly: "These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life" (1 John 5:13). God does not want His children living in perpetual uncertainty about their standing before Him. He wants you to know.
Assurance is not arrogance. It is not the claim that you deserve salvation or that you are better than others. It is simply trusting the word of God more than your own fluctuating feelings. When God says you have eternal life, you can take Him at His word.