The mind is restless, always desiring something, desiring something. So the best policy to control the mind is to desire how to spread Krsna consciousness. This is the best. Kamah krsna-karmarpane. Narottama dasa Thakura has said that you cannot be free from desire. That is not possible. This is useless attempt. They say that "You become desireless." No, that is not possible. How can I? If I become desireless, I become dead. So long I am living entity, I must desire. I cannot check it. Therefore kama means desire. So at the present moment, we are desiring how to become happy in this material world, how to acquire so much money, how to acquire this, how to acquire this, how to get this, how to get that. This is kama. So this brain taxation, if you engage in Krsna's service — how to spread Krsna consciousness, how to convince people about Krsna, how to take them to the Krsna's desire, sarva-dharman parityajya [Bg. 18.66] — and in this way, if you go on making plan for spreading Krsna consciousness, then your mind is controlled.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 3.26.27 — January 4, 1975, Bombay