Love, not hate, must come to birth;
Christ, not Cain, must rule the earth.
Edwin Markham (modified by MK)
I don’t remember where I found this little poem and I have no idea who Ed Markham was (is?). But what a great thought! What if our world were controlled by something other than selfishness, hatred, and violence? This is the promise of a truly Christian world. Christians do not want to conquer the world. They just want to live in a world where Christ reigns in the hearts of every citizen.
I am teaching a class on the Letters of John right now, and we have been looking at the often-overlooked books of 2 John and 3 John. A great passage comes in 2 John 5 & 6:
5 And now, dear lady, I am not writing you a new command but one we have had from the beginning. I ask that we love one another. 6 And this is love: that we walk in obedience to his commands. As you have heard from the beginning, his command is that you walk in love.
The unswerving love of fellow believers is what Francis Schaeffer so aptly called the “Mark of the Christian.” As Schaeffer says, it is “the mark that Jesus gives to label a Christian not just in one era or in one locality but at all times and all places until Jesus returns.” And this “mark” has continually renewed the church when it has been rediscovered. The Jesus People and youth of the 1960s loved to sing, “and they’ll know we are Christians by our love” and they infused life and love into the church. In today’s post-denominational era, churches that don’t just talk about love but actually demonstrate it are attractive to outsiders, far more than flashy preachers or fancy buildings.
They will gather as friends and say, "Come, let us try the Master's way. Ages we tried the way of swords. And earth is weary of hostile hordes. Comrades, read out his words again: They are the only hope for men! Love and not hate must come to birth: Christ and not Cain must rule the earth."
Nebraska Christian College
 Francis Schaeffer, The Mark of the Christian (Downers Grove: InterVarsity, 1970).