Chandogya Upanishad 7.7

1. ‘Understanding (_vijñāna_), assuredly, is more than Meditation. Verily, by Understanding one understands the Rig-Veda, the Yajur-Veda, the Sāma-Veda, the Atharva-Veda as the fourth, Legend and Ancient Lore (_itihāsa-purāṇa_) as the fifth, the Veda of the Vedas [i.e. Grammar], Rites for the Manes, Mathematics, Augury (_daiva_), Chronology, Logic, Polity, the Science of the Gods (_deva-vidyā_), the Science of Sacred Knowledge (_brahma-vidyā_), Demonology (_bhūta-vidyā_), Military Science (_kṣatra-vidyā_), Astrology (_nakṣatra-vidyā_), the Science of Snake-charming, and the Fine Arts (_sarpa-devajanavidyā), as well as heaven and earth, wind and space, water and heat, gods and men, beasts and birds, grass and trees, animals together with worms, flies, and ants, right and wrong, true and false, good and bad, pleasant and unpleasant, food and drink, this world and the yonder—all this one understands just with Understanding. Reverence Understanding.

2. He who reverences Understanding as Brahma—he, verily, attains the worlds of Understanding (vijñāna) and of Knowledge (jñāna). As far as Understanding goes, so far he has unlimited freedom, he who reverences Understanding as Brahma.’ ‘Is there, Sir, more than Understanding?’ ‘There is, assuredly, more than Understanding.’ ‘Do you, Sir, tell me it.’