Senses means they want some activity. Just like our eyes. If . . . the eyes want to see something beautiful. The tongue, tongue wants to taste something very sweet. The ear, it wants to hear something very melodious. In this way we have got our different senses. But the yoga system is trying to stop them. Now, just try to understand.
Now, here, the bhakti-yoga system is that if you stick to the hearing of Hare Kṛṣṇa and the music, melodious music of khol, karatāla, then naturally you become detestful for hearing other songs. So this is practically indriya-saṁyama. The bhakti process is that sarvopādhi-vinirmuktaṁ tat-paratvena nirmalam (CC Madhya 19.170). You cannot stop the senses to work. That is the negative process. Because the senses are meant for working. Therefore you have to give better engagement to the senses. That will be explained in the . . . it is already explained in the Bhagavad-gītā, Second Chapter, paraṁ dṛṣṭvā nivartate (BG 2.59). Paraṁ dṛṣṭvā nivartate. If you force one . . . if you force one to stop, it is very difficult. Therefore so many yogīs also failed.
Just like Viśvāmitra Muni. By force, he was trying to control his senses, but as soon as the sense got opportunity, one Menakā, a heavenly society girl, came before him, he became captivated. He became captivated. These examples are there. And the child was born, Śakuntalā. You know, everyone. So he was a great yogī. He also failed, because it was artificially being tried.