The spiritual master's order should be taken as the prime duty of life. If one gets a bona fide spiritual master and acts according to his direction, then his perfection of life in Krishna Consciousness is guaranteed.
Only to the one who is engaged in pure devotional service under proper guidance is Lord Krishna revealed.
By the slow process of devotional service, under the guidance of the bona fide spiritual master, one can attain the highest stage.
One should act very diligently, under the expert guidance of a devotee of Lord Krishna, or under the direct instructions of Lord Krishna Himself (under whom Arjuna had the opportunity to work). Nothing should be performed for sense gratification.