The conclusion is that to increase attachment for the Supreme Personality of Godhead one has to accept a bona fide spiritual master and learn from him the methods of devotional service and hear from him about the transcendental message and glorification of the Supreme Personality of Godhead. In this way one has to increase his conviction about devotional service. Then it will be very easy to increase attachment for the Supreme Personality of Godhead.

From Srila Prabhupada's purport to SB 4.22.22