“I have written this to you who believe in the name of the Son of God, so that you may know you have eternal life” (1 John 5:13)

John made it easy for his readers to understand his letter’s purpose: Assurance of salvation. John says that we can “know” that we have eternal life. Notice he doesn’t say that we can hope, think, wonder, pray… No, he says we can “know” with certainty that if we have received Jesus, we have eternal life!