Guru means who opens the eyes of the ignorant person. Ajñāna-timirāndhasya jñānāñjana-śalākayā. Opening the eyes by giving real knowledge. . . Guru-kṛṣṇa kṛpā pāya bhakti-latā-bīja. So bhakti-latā, the devotional service, the seed of devotional service, can be received by the paramparā system through bona fide spiritual master. And if we abide by the orders of spiritual master faithfully, then Kṛṣṇa becomes pleased. That is stated by Viśvanātha Cakravartī Ṭhākura, yasya prasādād bhagavat-prasādaḥ. Āra nā koriya mane āśā. Narottama dāsa. . . All the ācāryas, they say like that. Ācāryam māṁ vijānīyāt. Ācāryavān puruṣo veda (Chāndogya Upaniṣad 6.14.2): "One who has accepted ācārya, he knows things as they are." Others, they do not know. It is not possible.
So Advaita Ācārya is the typical example how to become ācārya. All are our ācāryas: śrī-kṛṣṇa-caitanya prabhu-nityānanda, śrī-advaita gadādhara śrīvāsādi-gaura-bhakta-vṛnda. All of them are ācāryas because they are following the ācārya, supreme ācārya, Caitanya Mahāprabhu. Therefore they are ācārya. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ (BG 4.2). So we have to follow the ācārya. Then, when we are completely, cent percent follower of ācārya, then you can also act as ācārya. This is the process. Don't become premature ācārya. First of all follow the orders of ācārya, and you become mature. Then it is better to become ācārya. Because we are interested in preparing ācārya, but the etiquette is, at least for the period the guru is present, one should not become ācārya. Even if he is complete he should not, because the etiquette is, if somebody comes for becoming initiated, it is the duty of such person to bring that prospective candidate to his ācārya. Not that "Now people are coming to me, so I can become ācārya." That is avamanya. Nāvamanyeta karhicit. Don't transgress this etiquette. Nāvamanyeta. That will be falldown.
Just like during the lifetime of our Guru Mahārāja, all our Godbrothers now who are acting as ācārya, they did not do so. That is not etiquette. Ācāryaṁ māṁ vijānīyāt na avaman. . . That is insult. So if you insult your ācārya, then you are finished. Yasya prasādād bhagavat-prasādo yasya aprasādāt na gatiḥ kuto 'pi - finished. If you displease your ācārya, then you are finished. Therefore it is said, Caitanya Mahāprabhu says to all the ācāryas. . . Nityānanda Prabhu, Advaita Prabhu and śrīvāsādi-gaura-bhakta-vṛnda, they are all carriers of orders of Śrī Caitanya Mahāprabhu. So try to follow the path of ācārya process. Then life will be successful.