"With clear understanding of differences between good and evil rational human minds can take necessary steps to avoid evil and embrace good. One appreciates light better with an in-depth understanding of darkness.Only when we know what evil can do will we arrive at goodness with certainty." Good thinking. So, the darkness is there so that we can understand the value of light. So, the night is there so that we can understand the value of day. So the sorrow is there so that we can understand the value of happiness. So the evil is there so that we can understand the value of God! God is smart. He knows how to maintain his status ;)