The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c7.s6.t2.2

c7.s6.t2.2

1. “Çvetaketu was the son of [Uddâlaka] Âruṇi. His father said to him: ‘Çvetaketu, go forth to study Brahman, for one of our family, dear one, is not wont to remain unlearned, and [merely] an appendage of Brahmanhood.’—So he went when he was twelve years old, to study, and at twenty-four he had studied all the Vedas, and returned uplifted in mind, fancying himself wise, and very proud. Then his father said to him: ‘Çvetaketu! since, dear one, thou art so uplifted in mind, fancying thyself so wise, and since thou art so proud, hast thou enquired concerning the teaching through which [even] the unheard is [already] heard, what is not understood is understood, and what is unknown becomes known?’—‘What then, venerable Sir, is this teaching?’—‘Just as, dear one, by one lump of clay everything which consists of clay is known, and the change is dependent only on words, a mere name, it is only clay in reality;—just as, beloved, by one copper button everything made of copper is known, the change is dependent only on words, a mere name, and it is only copper in reality;—just as, dear one, by one pair of nail-scissors everything made of iron is known, the change is dependent only on words, a mere name, and it is only iron in reality;—so, dear one, is it with this teaching.’—‘Of a truth my venerable teachers did not know this themselves, for if they had known it, why did they not tell it to me? But do thou, venerable one, now make it clear to me!’—‘So be it, dear one!’—”