The Buddhist doctrine of the good and the bad; wholesome and unwholesome; pure and impure; their nature, causes, and effects. Why is something or someone good or bad? What make it good or bad? What about neutrality or mixture of the good or bad? Is there anything that could be intrinsically good or bad? Consider the figure Devadatta! Is he personification of the evil? Stories in the Jātaka is full of good and bad people, good and bad deeds, good and bad heart? What would be a good or bad thought and deed? What about the allegory of Maṭam Rudra?