If you want to increase your love for Kṛṣṇa, or God, you must associate with persons who are interested in this business—devotees.
These devotees, they have no other interest. All these boys and girls who are under my direction, they have no other interest, simply Kṛṣṇa. So we have to associate with such persons, adau śraddhā tato sādhu-saṅga (CC Madhya 22.54). Sādhu-saṅga means to associate with the devotees. Adau śraddhā tato sādhu-saṅga. Sādhu. Sādhu, this word, Sanskrit word, is meant for the devotees, the lover of Kṛṣṇa. That is also explained in the Bhagavad-gītā: sādhur eva sa mantavyaḥ (BG 9.30). Api cet sudurācāro bhajate mām ananya-bhāk, sādhur eva sa mantavyaḥ. One who has unflinching faith in Kṛṣṇa, one who is cent percent engaged to render service to Kṛṣṇa, he is called sādhu. Sādhu does not mean a kind of dress or kind of beard. No. Sādhu means a devotee, perfect devotee of Kṛṣṇa. That is . . . he is sādhu.
Therefore it is recommended, sādhu-saṅga. We have to associate with sādhu, means who have completely dedicated life for Kṛṣṇa's service. That is the injunction in the Bhagavad-gītā. Man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65). This process is very simple. Kṛṣṇa advises, Himself, how to become a sādhu, how to become a saintly person. That is also. Only follow four principles: man-manā bhava mad-bhakto. You simply think of Kṛṣṇa, man-manā. You just become devotee of Kṛṣṇa, man-manā bhava mad-bhak . . . mad-yājī—you simply worship Kṛṣṇa. Man-manā bhava mad-bhak . . . māṁ namaskuru—"You offer your obeisances unto Me." These four principles.