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Śrīmad-Bhāgavatam
[Canto 3, Ch. 32]
All these different activities are prescribed for different persons so that they may be elevated to the platform of self-realization and from there to Kṛṣṇa consciousness, devotional service.
The words  bhakti-yogena caiva hi  mean that whatever is to be performed, as described in verse 34, whether  yoga , or sacrifice, or fruitive activity, or study of Vedic literature, or philosophical research, or acceptance of the renounced order of life, is to be executed in  bhakti-yoga . The words  caiva hi , according to Sanskrit grammar, indicate that one must perform all these activities mixed with devotional service, otherwise such activities will not produce any fruit. Any prescribed activity must be performed for the sake of the Supreme Personality of Godhead. It is confirmed in  Bhagavad-gītā ,  yat karoṣi yad aśnāsi : “Whatever you do, whatever you eat, whatever you sacrifice, whatever austerities you undergo and whatever charities you give, the result should be given to the Supreme Lord.” The word  eva  is added, indicating that one must execute activities in such a way. Unless one adds devotional service to all activities, he cannot achieve the desired result, but when  bhakti-yoga  is prominent in every activity, then the ultimate goal is sure.
One has to approach the Supreme Personality of Godhead, Kṛṣṇa, as it is stated in  Bhagavad-gītā : “After many, many births, one approaches the Supreme Person, Kṛṣṇa, and surrenders unto Him, knowing that He is everything.” Also in  Bhagavad-gītā , the Lord says,  bhoktāraṁ yajña-tapasām : “For anyone who is undergoing rigid austerity or for anyone who is performing different kinds of sacrifices, the beneficiary is the Supreme Personality of Godhead.” He is the proprietor of all planets, and He is the friend of every living soul.
The words  dharmeṇobhaya-cihnena  mean that the  bhakti-yoga  process contains two symptoms, namely attachment for the Supreme Lord and detachment from all material affinities. There are two symptoms of advancement in the process of devotional service, just as there are two processes taking place while eating. A hungry man feels strength and satisfaction from eating, and at the same time he gradually becomes detached from eating any more. Similarly, with the execution of devotional service, real knowledge develops, and one becomes detached from all material activities. In no other activity but devotional service is there such detachment from matter and attachment for the Supreme. There are nine different processes to increase this attachment to the Supreme Lord: hearing, chanting, remembering, worshiping, serving the Lord, making friendship, praying, offering everything, and serving the lotus feet of the Lord. The processes for increasing detachment from material affinities are explained in verse 36.