We have to approach a pure Vaishnava as spiritual master

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Srimad-Bhagavatam 7.9.28

by His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Mayapur, March 6, 1976

yasya prasadad bhagavat-prasado
yasyaprasadad na gatih kuto ‘pi
kintu prabhor yah priya eva tasya

Guru is described, yasya prasadad bhagavat-prasadah: “By the mercy of guru one can achieve the mercy of the Supreme Personality of Godhead.” Yasya prasada. Yasya aprasadat: “If guru is not pleased, then he has no place.” Na gatih kuto ‘pi.

saksad dharitvena samasta-sastrair
uktas tatha bhavyata eva sadbhih
kintu prabhor yah priya eva tasya

Why the spiritual master position is so great? Because he is very, very confidential servant of Krishna; therefore his position is so great.
So this is the process. Tava bhrtya-seva. We have to… Adau gurvasrayam. First beginning of Vaishnava life is to accept guru, spiritual master, adau gurvasrayam, then other things. Because who will teach you? So we have to approach a pure Vaishnava as spiritual master, follow his instruction.

And what is his instruction? His instruction is as he was instructed by his spiritual master. He does not invent instruction. This is instruction. The pure Vaishnava, he does not invent anything new. Yare dekha tare kaha krsna upadesa [Cc. Madhya 7.128]. Full Lecture