In that way, evil was created. There was no evil in the beginning. Lucifer acted against the Principle. That became evil. Evil is not something entirely different from love.
Evil is the misuse of love.
Good is the right and proper use of love. If we love God, that is all right. But if we love something or someone against God's will, that is evil. If we love someone or something in accordance with God's will, that is good. Because the power of love was so strong, God had warned that Adam and Eve not even touch one another.