So you have to train yourself to become svāmī, 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 servitude of this material world.