Servant we are, because constitutionally I am servant. And because I am not servant of God or servant of Kṛṣṇa, that I have become servant of my dog. In the morning I go with my dog. The dog says, "Yes, stand up here." "Yes, I am standing." "Let me pass my stool." "Yes, my dear sir. It is very nice." So I am servant. But I have no shame that I have become servant of dog and I'm refuse to (be) servant of God. Such a foolish we are. You see? So Prahlāda Mahārāja says, "Just change this kindly. Don't become any more servant of..." Servant of dog means servant of your senses. That's all. We are here all servant of senses. That's all. A swami means master of the senses. "Oh, sense wants? Oh, my tongue wants immediately to smoke? There is some sensation. Oh, I must say, 'No. There is no smoking. Stop.' " Then you are master. And if you have become servant, "Oh, I want. Will you kindly give me a cigarette?" Because I am servant of cigarette. So you have to train yourself to become swami, master of your senses. Then everything is all right. Don't be servant of your senses. Servant you are. Just change your servitorship. Instead of becoming servant of senses, just become the servant of the master of the senses. The master of senses is Kṛṣṇa. Therefore He is called Hṛṣīkeśa. And Kṛṣṇa consciousness means hṛṣīkena hṛṣīkeśa-sevanaṁ bhaktir ucyate (CC Madhya 19.170). Devotional service means to serve the master of the senses with your purified senses. That's all. You haven't got to stop your sensual activities, but now you are serving the senses by the dictation of the senses. Now, while you will serve the master of the senses, then your perfection will come.
So Prahlāda Mahārāja is advising, "My dear boyfriends," tad bīja-nirharaṇaṁ yogaḥ, "you practice yoga just to become master of your senses." Not that officially I sit down, fifteen minutes' meditation, and next moment I am master of my senses. This is not yoga. Here it is called bīja-nirharaṇaṁ yogaḥ. Just practice such kind of yoga by which you can kill the seed of your servant of this material world.