(The above photo appeared on the back cover of Easy Journey to Other Planets, 1972)
"So unnecessary waste of life, we should be very careful. That is Kṛṣṇa consciousness. That is the criterion of Kṛṣṇa conscious life. We should not waste our time. That is advised by Rūpa Gosvāmī also. Avyartha-kālatvam (CC Madhya 23.18-19). We should be very cautious not to waste a single moment without Kṛṣṇa consciousness. So we have got so many activities. If we have no activities, then we can polish the floor of the temple. That is not very difficult. If I am illiterate, I have no interest in reading books, I have no interest in chanting or I cannot do it constantly, then take something and mop over the temple and cleanse the temple. That is also service. It is not that one who is engaged in the Deity worship, he is better engaged, and one who is polishing the floor, he is less engaged. No. Both of them will get equal benefit. Kṛṣṇa consciousness is so nice. So find out some business for Kṛṣṇa. Don't waste time. That is the perfection of Kṛṣṇa consciousness."
(Srila Prabhupada Lecture, Los Angeles, January 3, 1974)