In the last stage of the spiritual master's life, the devotees of the spiritual master should take preaching activities into their own hands. In this way the spiritual master can sit down in a solitary place and render nirjana-bhajana.
A. C. Bhaktivedanta Swami PrabhupadaBy the grace of the spiritual master the cloud of the mercy of the Personality of Godhead is brought in, and then only, when the rains of Krishna consciousness fall, can the fire of material existence be extinguished.
A. C. Bhaktivedanta Swami PrabhupadaSince one cannot visually experience the presence of the Supersoul, He appears before us as a liberated devotee. Such a spiritual master is none other than Krishna himself.
A. C. Bhaktivedanta Swami PrabhupadaA spiritual master who is one hundred percent Krishna conscious is the bona fide spiritual master.
A. C. Bhaktivedanta Swami Prabhupada