"The criterion is that a devotee must know what Kṛṣṇa wants him to do.

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Caitanya Caritamrita 1975
Madhya Lila 19.167
Purport

  "The criterion is that a devotee must know what Kṛṣṇa wants him to do. This can be achieved through the medium of the spiritual master who is a bona fide representative of Kṛṣṇa. Śrīla Rūpa Gosvāmī advises, ādau gurv-āśrayam. One who is serious in wanting to render pure devotional service to the Lord must take shelter of the spiritual master who comes in the disciplic succession from Kṛṣṇa. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ. Without accepting a bona fide spiritual master coming in the disciplic succession, one cannot find out the real purpose of devotional service. Therefore one has to accept the shelter of a bona fide spiritual master and agree to be directed by him. The first business of a pure devotee is to satisfy his spiritual master, whose only business is to spread Kṛṣṇa consciousness. Yasya prasādād bhagavat-prasādaḥ: if one can satisfy the spiritual master, Kṛṣṇa is automatically satisfied. This is the success of devotional service. This is the meaning of the word ānukūlyena-that is, favorable devotional service to the Lord. A pure devotee has no plans other than those for the Lord's service. He is not interested in attaining success in mundane activities. He simply wants success in the progress of devotional service. For a devotee, there cannot be worship of others or demigod worship. A pure devotee does not engage himself in such pseudo-devotional service. He is interested only in satisfying Kṛṣṇa. If one lives only for the satisfaction of Kṛṣṇa, he does not have to accept this order or that order. One's only business should be to satisfy Kṛṣṇa. This process is completely manifest in the activities of the Kṛṣṇa consciousness movement. It has been actually proved that the entire world can accept devotional service without failure. One simply has to follow the instructions of the representative of Kṛṣṇa."