One must first become a pure devotee by following the strict regulative principles and chanting sixteen rounds daily, and when one thinks that he is actually on the Vaisnava platform, he must then take permission from the spiritual master

Expressions researched:
"One must first become a pure devotee by following the strict regulative principles and chanting sixteen rounds daily, and when one thinks that he is actually on the Vaiṣṇava platform, he must then take permission from the spiritual master"

CC Adi-lila

One must first become a pure devotee by following the strict regulative principles and chanting sixteen rounds daily, and when one thinks that he is actually on the Vaiṣṇava platform, he must then take permission from the spiritual master, and that permission must also be confirmed by Kṛṣṇa from within his heart. Then, if one is very sincere and pure, he can write transcendental literature, either prose or poetry.

CC Adi 8.73, Translation and Purport:

Having received the order of the Vaiṣṇavas but being anxious within my heart, I went to the temple of Madana-mohana in Vṛndāvana to ask His permission also.

A Vaiṣṇava always follows the order of guru and Kṛṣṇa. Śrī Caitanya-caritāmṛta was written by Kṛṣṇadāsa Kavirāja Gosvāmī by their mercy. Kṛṣṇadāsa Kavirāja Gosvāmī considered all the devotees that have been mentioned to be his preceptor gurus, or spiritual masters, and Madana-gopāla (Śrī Madana-mohana vigraha) is Kṛṣṇa Himself. Thus he took permission from both of them, and when he received the mercy of both guru and Kṛṣṇa, he was able to write this great literature, Śrī Caitanya-caritāmṛta. This example should be followed. Anyone who attempts to write about Kṛṣṇa must first take permission from the spiritual master and Kṛṣṇa. Kṛṣṇa is situated in everyone's heart, and the spiritual master is His direct external representative. Thus Kṛṣṇa is situated antar-bahiḥ, within and without. One must first become a pure devotee by following the strict regulative principles and chanting sixteen rounds daily, and when one thinks that he is actually on the Vaiṣṇava platform, he must then take permission from the spiritual master, and that permission must also be confirmed by Kṛṣṇa from within his heart. Then, if one is very sincere and pure, he can write transcendental literature, either prose or poetry.