Srimad Bhagavatam Canto 11, Chapter 28, Text 19

SB 11.28.19

yatha hiranyam sv-akrtam purastat
 pascac ca sarvasya hiran-mayasya
tad eva madhye vyavaharyamanam
 nanapadesair aham asya tadvat
Gold alone is present before its manufacture into gold products, the gold alone remains after the products’ destruction, and the gold alone is the essential reality while it is being utilized under various designations. Similarly, I alone exist before the creation of this universe, after its destruction and during its maintenance.
Gold is manufactured into many types of jewelry, as well as into coins and other luxurious products. But at each stage — before manufacture, during manufacture, during utilization and afterward — the essential reality is gold. In the same way, the Supreme Personality of Godhead is the essential reality — both the dynamic and the ingredient cause of everything. All throughout the material creation, the Lord is simply setting into motion His own potency, which is not different from Him.
Srimad Bhagavatam Canto 11, Chapter 28, Text 18
Srimad Bhagavatam Canto 11, Chapter 28, Text 20