One verse

Srimad Bhagavatam 3.6.34

3.6.34

एते वर्णा: स्वधर्मेण यजन्ति स्वगुरुं हरिम् । श्रद्धयात्मविशुद्ध्यर्थं यज्जाता: सह वृत्तिभि: ॥ ३४ ॥

ete varnah sva-dharmena yajanti sva-gurum harim sraddhayatma-visuddhy-artham yaj-jatah saha vrttibhih

ete
all these
varnah
orders of society
sva-dharmena
by one’s own occupational duties
yajanti
worship
sva-gurum
with the spiritual master
harim
the Supreme Personality of Godhead
sraddhaya
with faith and devotion
atma
self
visuddhi-artham
for purifying
yat
from whom
jatah
born
saha
along with
vrttibhih
occupational duty.

All these different social divisions are born, with their occupational duties and living conditions, from the Supreme Personality of Godhead. Thus for unconditional life and self-realization one has to worship the Supreme Lord under the direction of the spiritual master.