Just like Brahmā, the best authority because he is the first living being created within the universe. Ādi-puruṣa. Not ādi-puruṣa; ādi-kavi. Ādi-puruṣa is Kṛṣṇa. Brahmā is ādi-kavi, the original learned scholar. So our theory of creation means first of all Brahmā is created. So Brahmā is called ādi-kavi. Tene brahma hṛdā ya ādi-kavaye (SB 1.1.1). Ādi-kavaye means Brahmā. So Brahmā's knowledge, what does he say? Brahmā says govindam ādi-puruṣaṁ tam ahaṁ bhajāmi **. Brahmā says Govinda, Kṛṣṇa. Cintāmaṇi-prakara-sadmasu kalpa-vṛkṣa-lakṣāvṛteṣu surabhīr abhipālayantam (Bs. 5.29). He's giving description about Kṛṣṇa in the Brahma-saṁhitā. And the description of Kṛṣṇa's abode. Cintāmaṇi-prakara-sadmasu kalpa-vṛkṣa-lakṣāvṛteṣu surabhīr abhipālayantam (Bs. 5.29). Everything is there. This is authority, śruti. Kṛṣṇa is very much fond of tending cows. Surabhīr abhipālayantam. Cintāmaṇi-prakara-sadmasu. He has got His abode, Goloka Vṛndāvana, where the residential houses are made of cintāmaṇi, touchstone. Touchstone, we have heard the description. Touchstone means the stone which you touch to the iron and the iron becomes gold. So such touchstone, they're used as brick.