His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda. The leading exponent of the science of Kṛṣṇa consciousness in the West and the world’s most distinguished teacher of Vedic religion and thought, he is the author of Bhagavad-gītā As It Is, Srimad-Bhagavatam, Kṛṣṇa and many other English versions of Vedic literature. He is a fully self-realized devotee of Lord Kṛṣṇa and is the latest disciple in a succession that originally began with Kṛṣṇa Himself. He is the founder and spiritual master of the International Society for Krishna Consciousness.

The secret of success in spiritual life

…is in satisfying the spiritual master and thereby getting his sincere blessings
SB 1.1.8 purport
One has to receive the transcendental sound from the right source, accept it as a reality and prosecute the direction without hesitation. The secret of success is to receive the sound from the right source of a bona fide spiritual master. Mundane manufactured sound has no potency, and as such, seemingly transcendental sound received from an unauthorized person also has no potency.
SB 2.9.8 purport

Spoken on this day

Letters on this day