And the Lord said unto Cain, Where is Abel your brother? And he said, I know not: Am I my brother's keeper?
And he [God] said, What have you done? the voice of your brother's blood cries unto me from the ground.
-- Genesis 4: 9-10
Since that day war has never ceased on our planet. The blood of Cain still runs into our veins but one day the PRINCE OF PEACE will obliterate war and death over the whole earth.