One verse

Srimad Bhagavatam 2.10.7

2.10.7

आभासश्च निरोधश्च यतोऽस्त्यध्यवसीयते । स आश्रय: परं ब्रह्म परमात्मेति शब्द्यते ॥ ७ ॥

abhasas ca nirodhas ca yato ’sty adhyavasiyate sa asrayah param brahma paramatmeti sabdyate

abhasah
the cosmic manifestation
ca
and
nirodhah
and its winding up
ca
also
yatah
from the source
asti
is
adhyavasiyate
become manifested
sah
He
asrayah
reservoir
param
the Supreme
brahma
Being
paramatma
the Supersoul
iti
thus
sabdyate
called.

The supreme one who is celebrated as the Supreme Being or the Supreme Soul is the supreme source of the cosmic manifestation as well as its reservoir and winding up. Thus He is the Supreme Fountainhead, the Absolute Truth.