1 John 2:28

And now, dear children, continue in him, so that when he appears we may be confident and unashamed before him at his coming.

(v28, NIV)

John continues to encourage his readers to continue in him. There are some who were with them, but they left. Those who had left proved to never really of them. Therefore, he encourages them to remain and continue. Those who continue in him prove to be those who were truly in him. What happens when you do not remain and abide in the Lord? Well, when he comes back, you're going to be ashamed. He's going to come back and ask you why you didn't remain in him. Your act of leaving proves that you were never really of the children of God, but you're still going to be ashamed regardless. Remain in him, that we may confident before him when he returns. Jesus tells the parable of the talents in Matthew 25. The first two servants were diligent with what they were given. Do you want to be like them and be confident on the day the master returns? Remain in him.