Cannot become a guru

Expressions researched:
"cannot be a guru" |" cannot become guru" |" cannot become a guru"

Srimad-Bhagavatam

SB Canto 4

SB 4.29.51, Purport: In Padma Purāṇa it is said:

ṣaṭ-karma-nipuṇo vipro

mantra-tantra-viśāradaḥ

avaiṣṇavo gurur na syād

vaiṣṇavaḥ śva-paco guruḥ

"Even if a brāhmaṇa is very learned in Vedic scriptures and knows the six occupational duties of a brāhmaṇa, he cannot become a guru, or spiritual master, unless he is a devotee of the Supreme Personality of Godhead. However, if one is born in a family of dog-eaters but is a pure devotee of the Lord, he can become a spiritual master." The conclusion is that one cannot become a spiritual master unless he is a pure devotee of the Lord.