Think of Krsna. That thinking of Krsna we have introduced. We have not introduced; it is introduced from Vedic literature — Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare. If you chant these sixteen words, it is not very difficult. Anyone, there is no secrecy. There is no charge for it. We don’t say that “I shall give you some secret mantra. You give me some money.” No. We don’t say. We openly chant this Hare Krsna mantra. Anyone can chant also. But see the effect of chanting this mantra. That is up to you. If you begin chanting, you’ll feel the effect very soon. So this is called man-manah, always thinking of Krsna. As soon as one chants Hare Krsna, immediately he remembers Krsna. He immediately remembers Krsna’s activities, Krsna’s pastimes, Krsna’s form, Krsna’s quality, Krsna’s attributes — everything. That is called to absorb the mind in Krsna. That means you become immediately the first-class yogi.
From Srila Prabhupada’s lecture on Bhagavad-gita 7.1 — Sydney, February 16, 1973