All the acaryas and saints of the world had spiritual masters

Expressions researched:
"all the ācāryas and saints of the world had spiritual masters"

SB Canto 3

Even Lord Caitanya, although He is Kṛṣṇa Himself, accepted a spiritual master; even Lord Kṛṣṇa accepted a spiritual master, Sāndīpani Muni, in order to be enlightened; and all the ācāryas and saints of the world had spiritual masters.

SB 3.7.39, Translation and Purport:

Spotless devotees of the Lord have mentioned the source of such knowledge. How could one have knowledge of devotional service and detachment without the help of such devotees?

There are many inexperienced persons who advocate self-realization without the help of a spiritual master. They decry the necessity of the spiritual master and try themselves to take his place by propagating the theory that a spiritual master is not necessary. Śrīmad-Bhāgavatam, however, does not approve this viewpoint. Even the great transcendental scholar Vyāsadeva had need of a spiritual master, and under the instruction of his spiritual master, Nārada, he prepared this sublime literature, Śrīmad-Bhāgavatam. Even Lord Caitanya, although He is Kṛṣṇa Himself, accepted a spiritual master; even Lord Kṛṣṇa accepted a spiritual master, Sāndīpani Muni, in order to be enlightened; and all the ācāryas and saints of the world had spiritual masters. In Bhagavad-gītā Arjuna accepted Lord Kṛṣṇa as his spiritual master, although there was no necessity of such a formal declaration. So, in all cases, there is no question about the necessity of accepting a spiritual master. The only stipulation is that the spiritual master should be bona fide; i.e., the spiritual master must be in the proper chain of disciplic succession, called the paramparā system.