Follow the regulative principles and chanting regularly – these two duties are essential for advancement in Krishna Consciousness and if they are made the center of our activities, then Krishna will begin to answer all questions from within as to how to become further advanced in His loving devotional service.
Letter to: Linda — Los Angeles 19 February, 1970
This life is very flickering. At any moment you may die. So we must cling very closely to the instruction of higher authorities, the spiritual master and Lord Krishna in Bhagavad gita.
Letter to: Radha-Kanta — Vrindaban 20 August, 1974
I see you, you see me. I touch you, you touch me. I taste something. This is gross. Above this gross there is mental platform. So mantra is also on the mental, which is little above intelligence and above that there is spiritual platform. So if on the mental platform, the mantra can act so wonderfully, how much spiritually the mantra can benefit you. You have to simply imagine. So this Hare Krishna mantra is completely spiritual. If you chant it, spiritually enlightened, then surely it will act.
Lecture on Srimad-Bhagavatam 1.7.19 — Vrndavana, September 16, 1976
Even by fighting, you can be a great devotee, just like Arjuna. He was not chanting on the beads, but he was fighting. But still, bhakto ‘si priyo ‘si me [Bg. 4.3]. Krishna says, “Oh, you are My great devotee.” Now people, may say that “He was not chanting. He was fighting. How he became a great devotee?” But Krishna says, bhakto ‘si priyo ‘si me: “You are My dear friend. You are My devotee. Because you are utilizing your energy for Me.” So bhakti means you utilize your energy for Krishna. Then your life is perfect.