Tamāla Kṛṣṇa: "While contemplating the objects of the senses, a person develops attachment for them, and from such attachment lust develops, and from lust anger arises (BG 2.62)." Purport. "One who is not Kṛṣṇa conscious is subjected to material desires while contemplating the objects of the senses. The senses require real engagements, and if they are not engaged in the transcendental loving service of the Lord, they will certainly seek engagement in the service of materialism."
Prabhupāda: Yes. Here is the secret of yoga system. Yoga indriya-saṁyama. The real purpose of yoga is to control the senses. Our material activities means to engage the sense in some particular objective or enjoyment. That is our material engagement. And yoga system means that you have to control the senses and detach the senses from material enjoyment, or material pleasure and pains, and divert it, focusing towards seeing the Supersoul Viṣṇu within your soul (self?). That is the real purpose of yoga. Yoga does not mean... Of course, in the beginning there are different rules and regulations, sitting posture, just to bring the mind under control. But they are not end themselves. The end is to stop the material engagement and begin spiritual engagement. So here it is explained.