Karma - required to perform action
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.
Taken from the book "Truth Eternal (5th edn., 2010)", Chapter "Karma", pg. 38, by Lalaji Maharaj