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Śrīmad-Bhāgavatam
[Canto 7, Ch. 5]
Puṁsārpitā viṣṇau.  The word  puṁsā  means “by all living entities.” There are no distinctions permitting only a man or only a  brāhmaṇa  to offer devotional service to the Lord. Everyone can do so. As confirmed in  Bhagavad-gītā  (9.32),  striyo vaiśyās tathā śūdrās te 'pi yānti parāṁ gatim : although women,  vaiśyas  and  śūdras  are considered less intelligent, they also can become devotees and return home, back to Godhead.
After performing sacrifices, sometimes a person engaged in fruitive activity customarily offers the results to Viṣṇu. But here it is said,  bhagavaty addhā : one must directly offer everything to Viṣṇu. This is called  sannyāsa  (not merely  nyāsa ). A  tridaṇḍi-sannyāsī  carries three  daṇḍas , signifying  kaya-mano-vākya —body, mind and words. All of these should be offered to Viṣṇu, and then one can begin devotional service. Fruitive workers first perform some pious activities and then formally or officially offer the results to Viṣṇu. The real devotee, however, first offers his surrender to Kṛṣṇa with his body, mind and words and then uses his body, mind and words for the service of Kṛṣṇa as Kṛṣṇa desires.
Śrīla Bhaktisiddhānta Sarasvatī Thākura gives the following explanation in his  Tathya . The word  śravaṇa  refers to giving aural reception to the holy name and descriptions of the Lord’s form, qualities, entourage and pastimes as explained in  Śrīmad-Bhāgavatam ,  Bhagavad-gītā  and similar authorized scriptures. After aurally receiving such messages, one should memorize these vibrations and repeat them ( kīrtanam ).  Śmaraṇam  means trying to understand more and more about the Supreme Lord, and  pāda-sevanam  means engaging oneself in serving the lotus feet of the Lord according to the time and circumstances.  Arcanam  means worshiping Lord Viṣṇu as one does in the temple, and  vandanam  means offering respectful obeisances.  Man-manā bhava mad-bhakto mad-yājī māṁ namaskuru .  Vandanam  means  namaskuru —offering obeisances or offering prayers. Thinking oneself to be  nitya-kṛṣṇa-dāsa , everlastingly a servant of Kṛṣṇa, is called  dāsyam , and  sakhyam  means being a well-wisher of Kṛṣṇa. Kṛṣṇa wants everyone to surrender unto Him because everyone is constitutionally His servant. Therefore, as a sincere friend of Kṛṣṇa, one should preach this philosophy, requesting everyone to surrender unto Kṛṣṇa.  Ātma-nivedanam  means offering Kṛṣṇa everything, including one’s body, mind, intelligence and whatever one may possess.