PURPORT

It is not possible for a conditioned soul to directly meet Krsna, the Supreme Personality of Godhead, but if one becomes a sincere devotee and seriously engages in devotional service, Lord Krsna sends an instructing spiritual master to show him favor and invoke his dormant propensity for serving the Supreme. The preceptor appears before the external senses of the fortunate conditioned soul, and at the same time the devotee is guided from within by the caittya-guru, Krsna, who is seated as the spiritual master within the heart of the living entity.