SB 6.9.38
sa eva hi punah sarva-vastuni vastu-svarupah sarvesvarah sakala-jagat-karana-karana-bhutah sarva-pratyag-atmatvat sarva-gunabhasopalaksita eka eva paryavasesitah.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
With deliberation, one will see that the Supreme Soul, although manifested in different ways, is actually the basic principle of everything. The total material energy is the cause of the material manifestation, but the material energy is caused by Him. Therefore He is the cause of all causes, the manifester of intelligence and the senses. He is perceived as the Supersoul of everything. Without Him, everything would be dead. You, as that Supersoul, the supreme controller, are the only one remaining.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The words sarva-vastuni vastu-svarupah indicate that the Supreme Lord is the active principle of everything. As described in the Brahma-samhita (5.35):
eko ’py asau racayitum jagad-anda-kotim
yac-chaktir asti jagad-anda-caya yad-antah
andantara-stha-paramanu-cayantara-stham
govindam adi-purusam tam aham bhajami
“I worship the Personality of Godhead, Govinda, who enters the existence of every universe and every atom by one of His plenary portions and thus manifests His infinite energy throughout the material creation.” By His one plenary portion as Paramatma, antaryami, the Lord is all-pervading throughout the unlimited universes. He is the pratyak, or antaryami, of all living entities. The Lord says in Bhagavad-gita (13.3), ksetra-jñam capi mam viddhi sarva-ksetresu bharata: “O scion of Bharata, you should understand that I am also the knower in all bodies.” Because the Lord is the Supersoul, He is the active principle of every living entity and even the atom (andantara-stha-paramanu-cayantara-stham). He is the actual reality. According to various stages of intelligence, one realizes the presence of the Supreme in everything through the manifestations of His energy. The entire world is permeated by the three gunas, and one can understand His presence according to one’s modes of material nature.