1 John 4:17-21 (New International Version)
17In this way, love is made complete among us so that we will have confidence on the day of judgment, because in this world we are like him. 18There is no fear in love. But perfect love drives out fear, because fear has to do with punishment. The one who fears is not made perfect in love.
19We love because he first loved us. 20If anyone says, “I love God,” yet hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen. 21And he has given us this command: Whoever loves God must also love his brother.
When God perfects His love in us, we should not fear or feel insecure. We remain secure in His grace. We don’t fear punishment or judgment. We are free to love others (1 John 4:19).