Please therefore continue to chant this mantra as many times as possible throughout the day and night. I do not think there is any inconvenience or loss on your part if you do so all the time. Even when you are walking, you can softly chant Hare Krishna, Hare Krishna, or even when you are on the bus going to somewhere you can also chant. When you are working with your hands you can also chant and when you are resting or going to take rest you can also chant. Even in your toilet room while taking bath you can also chant. In this way there is no limitation or restriction for chanting this Holy Name of God, Krishna, and His Energy, Hara. In doing this business there is no loss, but there is very great gain which is transcendental realization.
Letter to Sriman Minoru and Kenji, 22 April, 1970