So we should follow this instruction of Caitanya Mahaprabhu, yare dekha, tare kaha 'krsna'-upadesa. So you, every one of you, can become guru. You may say that "I am not interested to become a guru," but Caitanya Mahaprabhu says that if you are not interested, that is not very good. You should be interested. You must be guru. That is success of your life. You can speak the instruction of Krsna, even to your family. That also guru. You are actually guru. The father or the head of the family is guru to the children, to the wife. In India still, the wife addresses the husband as pati-guru. And father is guru. That is natural. So why don't you become real guru to your wife, to your children, and instruct Bhagavad-gita as it is? This is our mission. You sit down in the evening, chant Hare Krsna mantra and teach little instruction from the Bhagavad-gita. See how the life changes. Is that very difficult task?

(Srila Prabhupada; Conversation with Indian Guests  — March 13, 1975, Tehran)