Bhagavatapurana 5.18.36

5.18.36

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yasya svarūpaṃ kavayo vipaścito guṇeṣu dāruṣv iva jāta-vedasam /
mathnanti mathnā manasā didṛkṣavo gūḍhaṃ kriyārthair nama īritātmane //

36. "Sages who have attained insight into truth, eager to realise Thee lying hidden in all actions and results, churn Thee out with their mind out of the gross Phenomena of three gunas, just as they with a churn evolve fire out of (two) pieces of wood; to Thee Whose nature is thus discovered, I bow.