We have several times explained, bhakti means to engage all our senses in the service of the Lord. Our sense of seeing, eyes, nose, ears, tongue, hands, legs—everything should be engaged for Kṛṣṇa's service. All different parts of the body can be engaged. Hṛṣīkeṇa hṛṣīkeśa-sevanaṁ bhaktir ucyate (CC Madhya 19.170). Kṛṣṇa can be served by all our senses according to the direction of the śāstra and guru—sādhu, śāstra, guru. Just like Ambarīṣa Mahārāja. He is devotee. We have to follow. Sa vai manaḥ kṛṣṇa-padāravindayoḥ (SB 9.4.18). The senses. . . The mind is the chief of the senses, and immediately under the mind, ten senses are working, ten: five knowledge-gathering senses, jñānendriya, and five working senses, karmendriya. And they have got different types of activities—hands, legs, tongue, ear, eyes. And above these, there is ahaṅkāra, false ego in the material world. The eleven senses, and the twelfth is the false ego. The false ego means I am thinking, "I am this body. I am body." Then expansion of body: "I belong to this family"; "I am the husband of this body"; "I am the father of this body"; "I am the brother of this body." Or "I belong to this nation"; "I belong to this species." This is called twelfth conception. It is different consciousness according to different body. And then "It is mine." With all these eleven senses, I form an idea of "I" and then my possession, "mine." Ahaṁ mameti (SB 5.5.8). Janasya moho 'yam. This is called illusion, māyā.
So mind. It is expansion of the mind, different way. Mānasa-vṛtti. This is called the characteristic of the mind. Then subtle action of mind: thinking, feeling, willing. And the mind is expanding in hundreds, thousands, millions of ideas. In this way I am becoming entangled. So when this mind is controlled. . . The yoga system is for that purpose. Those who are too much bodily concept of life, bodily consciousness, they should practice this yoga—haṭha-yoga, aṣṭāṅga-yoga—so that the mind can be purified. As soon as the mind is purified, then all this expansion into thousands and millions of ideas will be controlled, and the only idea will be Kṛṣṇa. This is called yoga system, concentrating. Dhyānāvasthita yogena paśyanti yaṁ yoginaḥ. Dhyānāvasthita-manasā: "The mind is controlled, and the focus of the mind is on Kṛṣṇa or Viṣṇu." Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Then we can see the effulgence, and the localized, and then the Supreme Personality of Godhead.