SB 7.9.48
tvam vayur agnir avanir viyad ambu matrah
pranendriyani hrdayam cid anugrahas ca
sarvam tvam eva saguno vigunas ca bhuman
nanyat tvad asty api mano-vacasa niruktam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O Supreme Lord, You are actually the air, the earth, fire, sky and water. You are the objects of sense perception, the life airs, the five senses, the mind, consciousness and false ego. Indeed, You are everything, subtle and gross. The material elements and anything expressed, either by the words or by the mind, are nothing but You.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This is the all-pervasive conception of the Supreme Personality of Godhead, which explains how He spreads everywhere and anywhere. Sarvam khalv idam brahma: everything is Brahman — the Supreme Brahman, Krsna. Nothing exists without Him. As the Lord says in Bhagavad-gita (9.4):
maya tatam idam sarvam
jagad avyakta-murtina
mat-sthani sarva-bhutani
na caham tesv avasthitah
“I exist everywhere, and everything exists in Me, yet I am not visible everywhere.” The Lord can be visible only through devotional service. Tatra tisthami narada yatra gayanti mad-bhaktah: the Supreme Lord stays only where His devotees chant His glories.