Of course we have to control the mind, and I have already instructed you and all my students that the restless fickle mind can only be controlled by putting the mind to the lotus feet of Krsna, and that can best be done by chanting Hare Krsna mantra, and there is no alternative in this age. By chanting without offenses, the devotee cries to Radharani and Krsna to please lift him out of the material energy and put him into the spiritual energy, which is devotional service.
Letter to Govinda dasi, 20 July, 1973