Therefore there is failure. Those who are not engaged in Kṛṣṇa consciousness, simply artificially trying, they fail. Viśvāmitra Muni, Durvāsā Muni, there are many great instances. These are artificial. But that is a process recommended. We may be successful to a certain extent, but in this age it is very difficult to practice such things. Nobody can practice how to control the senses from the sense object.
So you have to employ your senses in the service of the owner of the senses. Kṛṣṇa is the owner of the..., Hṛṣīkeśa, the Lord of the senses. That people they do not know. I am thinking that this is my eye, these are my eyes. But actually these are explained in the Upaniṣads: Just like the sunshine. When the sun sees you, you can see the sun. Now at night the sun does not see you, so you cannot see the sun. You cannot see the sun, you cannot see anything, because the sun does not see you. Similarly the Upaniṣad says when Kṛṣṇa sees you or Kṛṣṇa sees, then you can see.
Srila Prabhupada's lecture on Bhagavad-gītā 5.26–29, Feb. 12, 1969, Los Angeles