CHĀNDOGYA UPANISHAD · 6.1.4

यथा सोम्यैकेन मृत्पिण्डेन सर्वं मृन्मयं विज्ञातं स्यात् ।
वाचारम्भणं विकारो नामधेयं मृत्तिकेत्य् एव सत्यम् ॥

yathā somyaikena mṛtpiṇḍena sarvaṃ mṛnmayaṃ vijñātaṃ syāt ।
vācārambhaṇaṃ vikāro nāmadheyaṃ mṛttikety eva satyam ॥

'What is that instruction, Sir?' he asked. The father replied: 'My dear, as by one clod of clay all that is made of clay is known, the difference being only a name, arising from speech, but the truth being that all is clay;