Chandogya Upanishad, Seventh Prapathaka
F. Max Müller (ed.), The Sacred Books of the East, Volume I, The Upanishads, Part I, Clarendon Press, Oxford, 1879
p. 109, The Chandogya Upanishad, Prapathaka 7, Khanda 1, Verse 1:
Narada approach ed Sanatkumara and said, ‘Teach me, Sir!’ Sanatkumara said to him: ‘Please to tell me what you know; afterward I shall tell you what is beyond.’1
ॐ॥ अधीहि भगव इति होपससाद सनत्कुमारं नारदस्त होवाच यद्वेत्थ तेन मोपसीद ततस्त ऊर्ध्वं वक्ष्यामीति स होवाच॥2
p. 112, The Chandogya Upanishad, Seventh Prapathaka 7, Third Khanda, Verse 1:
‘Mind (manas) is better than speech. For as the closed fist holds two amalaka or two kola or two aksha fruits, thus does mind hold speech and name. For if a man is minded in his mind to read the sacred hymns, he reads them; if he is minded in his mind to perform any actions, he performs them; if he is minded to wish for sons and cattle, he wishes for them; if he is minded to wish for this world and the other, he wishes for them. For mind is indeed the self , mind is the world, mind is Brahman. Meditate on the mind.3
मनो वाव वाचो भूयो यथा वै द्वे वामलके द्वे वा कोले द्वौ वाक्षौ मुष्टिरनुभवत्येवं वाचं च नाम च मनोऽनुभवति स यदा मनसा मनस्यति मन्त्रानधीयीयेत्यथाधीते कर्माणि कुर्वीयेत्यथ कुरुते पुत्राश्च पशूश्चेच्छेयेत्यथेच्छत इमं च लोकममुं चेच्छेयेत्यथेच्छते मनो ह्यात्मा मनो हि लोको मनो हि ब्रह्म मन उपास्स्वेति॥4