If we want to purify ourselves, we have to follow Lord Caitanya’s instructions: ceto darpanam-marjanam. . . A sincere devotee takes advantage of this method of purification. We do not simply practice rules and regulations to become purified. Rather, the rules and regulations are meant to help us become fixed in remembrance of Krsna and to realize our actual service.
Lectures From a Disciple, Vol 1, p. 243