But he who hates his brother is in the darkness, and walks in the darkness, and doesn't know where he is going, because the darkness has blinded his eyes.

 We began by saying that this is an idea which is as old as religion itself; men have always felt that in the universe there is a power which is in opposition to God. One of its earliest forms occurs in the Babylonian legend of creation. According to it there was in the very beginning a primeval sea monster called Tiamat; this sea monster was subdued by Marduk but not killed; it was only asleep and the final battle was still to come. That mythical idea of the primeval monster occurs in the Old Testament again and again. There the monster is often called Rahab or the crooked serpent or leviathan. "Thou didst crush Rahab like a carcass," says the Psalmist ( Psalms 89:10). "His hand pierced the fleeing serpent," says Job ( Job 26:13). Isaiah speaking of the arm of the Lord, says, "Was it not thou that didst cut Rahab in pieces, that didst pierce the dragon?" ( Isaiah 51:9). Isaiah writes: "In that day the Lord with his hard and great and strong sword will punish leviathan the fleeing serpent, leviathan the twisting serpent, and he will slay the dragon that is in the sea" ( Isaiah 27:1). All these are references to the primeval dragon. This idea is obviously one which belongs to the childhood of mankind and its basis is that in the universe there is a power hostile to God. 