🕉 Chāndogya Upaniṣad. The Upanishads, Introduced and Translated by Eknath Easwaran, pp.132-33.

 After Shvetaketu studied the Vedas for

twelve years and returned home, his father asked him if he knew that spiritual knowledge that enables you to hear the unheard, think the unthought and know the unknown.

“What is that wisdom, Father?”

asked the son.

Uddalaka said to Shvetaketu:

“As by knowing one lump of clay, dear one, we come to know all things made out of clay that they differ only in name and form, while the stuff of which all are made is clay. As by knowing one gold nugget, dear one,

we come to know all things made out of gold that they differ only in name and form, while the stuff of which all are made is gold. As by knowing one tool of iron, dear one, we come to know all things made out of iron that they differ only in name and form, while the stuff of which all are made is iron – so

through that spiritual wisdom, dear one, we come to know that all of life is one.”

“My teachers must not have known this wisdom,” said Shvetaketu, “for if they had known, how could they have failed to teach it to me? Please instruct me in this wisdom, Father.”

“Yes, dear one, I will,” replied his father.

“In the beginning was only Being, One without a second. Out of himself he brought forth the cosmos and entered into everything in it. There is nothing that does not come from him. Of everything he is the

inmost Self. He is the truth; he is the Self supreme. You are that,

Shvetaketu; you are that.”