Whoever remains in him doesn't sin. Whoever sins hasn't seen him, neither knows him.
Now coming to practical examples. You've been blessed, you've been prospered, you have a lot of world's goods. And now you see a brother in Christ who is in great need and you don't reach out to help him in his need. How can you really say that the love of Christ abides in you? "Oh, yes, I love him. Poor brother, I feel sorry for him. I love him so much. I feel so sorry for him. Not having any turkey this Christmas, it's a shame you know. Has to eat a Big Mac for Christmas, terrible. Oh, but I love him. Oh, how I love that man." No, No, no you don't. You can't really love them and shut your heart up on their need and be cold and calloused concerning their need. How does the love of God really dwell in you? How can you say that God's love dwells in you?