When a touchstone touches iron, it turns the iron to gold. Parvata Muni called Narada Muni a touchstone because by his touch the hunter, who was lowest among men, became an elevated and perfect Vaisnava. Srila Bhaktivinoda Thakura said that the position of a Vaisnava can be tested by seeing how good a touchstone he is-that is, by seeing how many Vaisnavas he has made during his life. A Vaisnava should be a touchstone so that he can convert others to Vaisnavism by his preaching, even though people may be fallen like the hunter. There are many so-called advanced devotees who sit in a secluded place for their personal benefit. They do not go out to preach and convert others into Vaisnavas, and therefore they certainly cannot be called sparsa-mani, advanced devotees. Kanistha-adhikari devotees cannot turn others into Vaisnavas, but a madhyama-adhikari Vaisnava can do so by preaching. Sri Caitanya Mahaprabhu advised His followers to increase the numbers of Vaisnavas.

It is Sri Caitanya Mahaprabhu's wish that everyone should become a Vaisnava and guru. Following the instructions of Sri Caitanya Mahaprabhu and His disciplic succession, one can become a spiritual master, for the process is very easy. One can go everywhere and anywhere to preach the instructions of Krsna. Bhagavad-gita is Krsna's instructions; therefore the duty of every Vaisnava is to travel and preach Bhagavad-gita, either in his country or a foreign country. This is the test of sparsa-mani, following in the footsteps of Narada Muni.