This constant practice is to engage oneself in something which reminds as Kṛṣṇa. Do something. Therefore we have so many activities. Not only kīrtana, but temple activities, prasāda activities, publication activities, so many activities. Everyone is engaged in some activities and Kṛṣṇa is the central point. Therefore a person who is typing for Kṛṣṇa, he is in yoga system. A person who is cooking for Kṛṣṇa, he is in yoga system. A person who is chanting in the street, distributing our literature, he's also in Kṛṣṇa. So by ordinary habits we are engaged, as in our material life we were engaged in so many things. If we mold our life in connection with Kṛṣṇa, then in every activity there is Kṛṣṇa consciousness and therefore this yoga perfection is there automatically.
(Lecture on Bhagavad-Gita------6:35:45-------purport).

At the initiation time we ask that "You don't touch all these things." Yes. That's all. See practically. Especially in the Western countries they are habituated to all these things, meat-eating, illicit sex, intoxication, gambling. How they give it up? Association. We are opening so many branches all over the world to give opportunity of association. It is not a business firm. Just to give spiritual association, chance. Why you are going the street saṅkīrtana? We are giving chance: "Come here, be saved." It is not business. So this Kṛṣṇa consciousness movement is the topmost philanthropy, welfare activities to the human society. Those who are intelligent, they are understanding.
(Lecture on Bhagavad-Gita------13:22-24-------purport).