studied, I am not a theologian. The bible see evil as working against God's will. God in his purest form is love (unconditional); evil would therefore be hate. You can get into really deeply philosophical debates but evil centers around the devil. Lucifer was the fallen angel that wanted to be God's equal. God vanquished him to earth for eternity or is known as the "fallen angel". Therefore, the devil has great spiritual powers but only of this world and the flesh. The devil disguises himself, uses the pleasure and desire of the flesh and is the consummate "liar". While not a simple question with a simple answer, evil is the work of the devil. More simply said, anything in opposition to God plan and order for you.