Thinking of Kṛṣṇa we have introduced. We have not introduced; it is introduced from Vedic literature—Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, 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 Kṛṣṇa 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 effect very soon.
So this is called man-manāḥ, always thinking of Kṛṣṇa. As soon as one chants Hare Kṛṣṇa, immediately he remembers Kṛṣṇa. He immediately remembers Kṛṣṇa's activities, Kṛṣṇa's pastimes, Kṛṣṇa's form, Kṛṣṇa's quality, Kṛṣṇa's attributes—everything. That is called to absorb the mind in Kṛṣṇa. That means you become immediately the first-class yogī. Yoginām api sarveṣāṁ mad-gatenāntarātmanā (BG 6.47). This is the process.
So these boys and girls who have taken to Kṛṣṇa consciousness movement seriously, they are all first-class yogīs because they are always thinking of Kṛṣṇa.