You know, we have only five senses: the eyes, the nose, the ears, the taste and the touch. We have something which is called ego – ahankaar. What reacts when we get angry is ego – ahankaar. What reacts when we are happy – somebody says, “You are a wonderful man,” is also ego.
Why is action (karma) necessary? Action is the law of manifestation of life. Without action, it is not possible to infer the existence of a being. That is why every being having a body is required to perform action. It was so required before, and will be required in the future. Life cannot exist without manifestation, for this is the specialty of the nature of all existence and beings. No life can be without manifestation