If the author of this epistle were writing to your congregation today, would he need to include this section? Does your congregation need to be reminded to love? to love each other? to love our brothers and sisters? to love people we don't even know? And which is harder for us, anyway, to love people we have to be around all the time or people that we don't?
Consider for a while today what verse 7 means to you. How does loving someone help you to know God? Or, how does knowing God help you to love someone?
The Father has sent his Son to save the world, verse 14. The world. God hasn't sent the Son to take us away from the world, to live separately from it, but to save it.