It is Krishna's Grace that the walls for the advertisements may be properly utilized so the passengers in the trains can see it. You write if possible the following words: "We request you to chant HARE KRISHNA HARE KRISHNA, KRISHNA KRISHNA HARE HARE, HARE RAMA HARE RAMA, RAMA RAMA HARE HARE, and your life will be sublime.'' The mantra may be written in big letters, and the other words in smaller letters. Another slogan may be "Join the Krishna Consciousness Movement. It is peaceful, and it will bring peace and prosperity to everyone.''
Letter to Krishna das, 8 October, 1969