What is our eternal occupatioal duty?

Our eternal, occupational duty is to render devotional service to the transcendental Personality of Godhead. This duty is both unchangeable and unchallengeable. Nowadays, various so-called eternal occupational duties have been proposed, but they are all unauthorized and non-vedic. They are nothing but the physical and mental activities of the karma and jnana-kandis. If we consider such concocted religious systems the eternal occupational duty of living entities, we will be cheated and will never attain peace.