One verse

Srimad Bhagavatam 10.80.32

10.80.32

स वै सत्कर्मणां साक्षाद् द्विजातेरिह सम्भव: । आद्योऽङ्ग यत्राश्रमिणां यथाहं ज्ञानदो गुरु: ॥ ३२ ॥

sa vai sat-karmaṇāṁ sākṣād dvijāter iha sambhavaḥ ādyo ’ṅga yatrāśramiṇāṁ yathāhaṁ jñāna-do guruḥ

saḥ
he
vai
indeed
sat
sanctified
karmaṇām
of duties
sākṣāt
directly
dvi-jāteḥ
of one who has been twice born
iha
in this material life
sambhavaḥ
birth
ādyaḥ
first
aṅga
My dear friend
yatra
through whom
āśramiṇām
for the members of all the spiritual orders of society
yathā
as
aham
Myself
jñāna
of divine knowledge
daḥ
the bestower
guruḥ
spiritual master

My dear friend, he who gives a person his physical birth is his first spiritual master, and he who initiates him as a twice-born brāhmaṇa and engages him in religious duties is indeed more directly his spiritual master. But the person who bestows transcendental knowledge upon the members of all the spiritual orders of society is one’s ultimate spiritual master. Indeed, he is as good as My own self.