ChU 6.1.6
यथा सोम्यैकेन नखनिकृन्तनेन सर्वं कार्ष्णायसं विज्ञातं स्यात् । वाचारम्भणं विकारो नामधेयं कृष्णायसम् इत्य् एव सत्यम् । एवं सोम्य स आदेशो भवतीति
yathā somyaikena nakhanikṛntanena sarvaṃ kārṣṇāyasaṃ vijñātaṃ syāt | vācārambhaṇaṃ vikāro nāmadheyaṃ kṛṣṇāyasam ity eva satyam | evaṃ somya sa ādeśo bhavatīti
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
'And as, my dear, by one pair of nail-scissors all that is made of iron (kârshnâyasam) is known, the difference being only a name, arising from speech, but the truth being that all is iron,—thus, my dear, is that instruction.'
Translated by F. Max Müller