There are two things in the world which can satisfy living beings. When one is materially engrossed, he is satisfied only by sense gratification, but when one is liberated from the conditions of the material modes, he is satisfied only by rendering loving service for the satisfaction of the Lord. This means that the living being is constitutionally a servitor, and not one who is served. Being illusioned by the conditions of the external energy, one falsely thinks himself to be the served, but actually he is not served; he is servant of the senses like lust, desire, anger, avarice, pride, madness and intolerance. When one is in his proper senses by attainment of spiritual knowledge, he realizes that he is not the master of the material world, but is only a servant of the senses. At that time he begs for the service of the Lord and thus becomes happy without being illusioned by so-called material happiness.
(Srimad Bhagavatam------1:12:6--------purport).

This is the material world. Everyone is trying to become master through various devices, although everyone is servant of his senses. Following this system, a living entity, although servant of his senses, tries to become master of the whole universe.
(Srimad Bhagavatam------7:3:12--------purport).

One who can keep himself steady and resist the attraction of material nature is certainly a hero and deserves to be called a gosvāmī. Unless one is master of the senses, he cannot become a gosvāmī. The living entity can take one of two positions in this world. He may become a servant of his senses, or he may become master of them. By becoming a servant of the senses, one becomes a great material hero, and by becoming master of the senses, he becomes a gosvāmī, or spiritual hero.
(Srimad Bhagavatam------4:25:25--------purport).

In this material world, everyone thinks that he has conquered his enemies, not understanding that his enemies are his uncontrolled mind and five senses (manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (B.G.15:7). In this material world, everyone has become a servant of the senses. Originally everyone is a servant of Kṛṣṇa, but in ignorance one forgets this, and thus one is engaged in the service of māyā through lusty desires, anger, greed, illusion, madness and jealousy. Everyone is actually dependent on the reactions of material laws, but still one thinks himself independent and thinks that he has conquered all directions. In conclusion, one who thinks that he has many enemies is an ignorant man, whereas one who is in Kṛṣṇa consciousness knows that there are no enemies but those within oneself—the uncontrolled mind and senses.
(Srimad Bhagavatam------7:8:10--------purport).

The conclusion is that one who can control these six items—speech, mind, anger, tongue, belly and genitals—is to be called a svāmī or gosvāmī. Svāmī means master, and gosvāmī means master of the go, or senses. When one accepts the renounced order of life, he automatically assumes the title of svāmī. This does not mean that he is the master of his family, community or society; he must be master of his senses. Unless one is master of his senses, he should not be called gosvāmī, but go-dāsa, servant of the senses. Following in the footsteps of the six Gosvāmīs of Vṛndāvana, all svāmīs and gosvāmīs should fully engage in the transcendental loving service of the Lord. As opposed to this, the go-dāsas engage in the service of the senses or in the service of the material world. They have no other engagement. Prahlāda Mahārāja has further described the go-dāsa as adānta-go, which refers to one whose senses are not controlled. An adānta-go cannot become a servant of Kṛṣṇa.
(Nectar of Instruction).