"You may inquire why we are chanting Hare Krishna. Hare Krishna, this name, was chanted by Lord Caitanya, who introduced this movement five hundred years ago in India. We are following the footprints of Lord Caitanya. Because He chanted Hare Krishna, therefore we are chanting Hare Krishna. But Lord Caitanya has recommended that God has innumerable names, and any one of them can be chanted, and there is no hard and fast rules and regulations for chanting. It is not that you have to prepare yourself or you have to educate yourself or you have to adjust yourself for chanting. No. Everyone... just like immediately we began to chant. You were not prepared, but you joined with us, you clapped with us, you danced with us. So similarly, there is no preoccupation or any rules and regulation. You simply chant. And this is very easy. While walking, you can chant whatever name you like. We like Krishna. We chant always: 'Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare.' While walking the streets, while you are going in the bus, and whatever, even while working with your hands, you can chant. There is no loss on your part. There is no expenditure on your part, but the gain is very great. Why don't you try it? Try it. That is our request."
(Srila Prabhupada lecture, June 15, 1968)