Prabhupāda: So far designation is concerned, the spiritual master authorizes every one of his disciple. But it is up to the disciple to carry out the order, able to carry out or not. It is not that spiritual master is partial, he designates one and rejects other. He may do that. If the other is not qualified, he can do that. But actually his intention is not like that.
He wants that each and every one of his disciple become as powerful as he is, or more than that. That is his desire. Just like father wants every son to be as qualified or more qualified than the father. But it is up to the student or to the son to raise himself to that standard.
Ātreya Ṛṣi: Yes, I understand.
Prabhupāda: If you are incapable of raising yourself to the standard of becoming spiritual master, that is not your spiritual master's fault, that is your fault. He wants, just like Caitanya Mahāprabhu said, āmāra ājñāya guru hañā (CC Madhya 7.128), "By My order, every one of you become a guru." Now if one cannot carry out the order of Caitanya Mahāprabhu, then how he can become a guru?
The first qualification is that he must be able to carry out the order of Caitanya Mahāprabhu. Then he becomes guru. So that carrying out the order of Caitanya Mahāprabhu depends on one's personal capacity. Āmāra ājñāya guru hañā. Acceptance of Caitanya Mahāprabhu as Kṛṣṇa, that is there in the śāstra: in the Upaniṣad, in Mahābhārata, in Bhāgavata.