Guru should...

Expressions researched:
"Guru should"

Srimad-Bhagavatam

SB Canto 4

Guru, should not be accepted as an ordinary man.

SB 4.21.11, Purport: The Supreme Godhead, His incarnations or His devotees may pose themselves as ordinary men, but they are never to be considered as such. Nor should an ordinary man not supported by authorized statements of the śāstras and ācāryas be accepted as an incarnation or devotee. By the evidence of śāstra, Sanātana Gosvāmī detected Lord Caitanya Mahāprabhu to be a direct incarnation of Kṛṣṇa, the Supreme Personality of Godhead, although Lord Caitanya never disclosed the fact. It is therefore generally recommended that the ācārya, or guru, should not be accepted as an ordinary man.