“Only unto those great souls who have implicit faith in both the Lord and the spiritual master are all the imports of Vedic knowledge automatically revealed.” – (Śvetāśvatara Upaniṣad 6.23)

This Vedic injunction is very important, and Śrī Caitanya Mahāprabhu supported it by His personal behavior. Believing in the words of His spiritual master, He introduced the saṅkīrtana movement, just as the present Kṛṣṇa consciousness movement was started with belief in the words of our spiritual master. He wanted to preach, we believed in his words and tried somehow or other to fulfill them, and now this movement has become successful all over the world. Therefore faith in the words of the spiritual master and in the Supreme Personality of Godhead is the secret of success.

Śrī Caitanya-caritāmṛta, Ādi 7.95–96, purport