Shvetaketu came home from twelve years at school feeling very pleased with himself.

He had been only a boy when his father, the sage Uddalaka, had sent him off to learn the Vedas. Now he was a young man, tall and well dressed, his memory packed full of hymns and rules and long lists he could recite without a single mistake. He walked back into his father's quiet forest hermitage with his chin held high, certain there was nothing left for anyone to teach him.

Uddalaka watched his son set down his bundle. He noticed the proud tilt of the boy's head. And gently, the way you test the depth of a river with one careful step, he asked a question.

"Shvetaketu," he said, "you seem so sure of yourself. So tell me — did you ask your teachers for that teaching by which the unheard becomes heard, the unthought becomes thought, the unknown becomes known?"

Shvetaketu blinked. "What teaching is that, father? I never heard of such a thing."

Uddalaka smiled, but not unkindly. He picked up a small lump of clay from the ground.

"Look. By knowing this one piece of clay, you know every clay thing there is — every pot, every cup, every lamp, every tile. They have different names and different shapes, but the truth of all of them is just: clay. Know the clay, and you know them all."

Shvetaketu stared at the little grey lump in his father's hand.

"All those hymns you memorised," Uddalaka went on, "they are like knowing the names of a thousand clay pots one by one. Useful. But there is one deeper knowing — the clay itself — and once you have that, nothing more is left over to learn. Every other thing is already inside it."

For the first time in twelve years, Shvetaketu felt his proud certainty go soft and quiet. He had filled his head with countless facts. He had never once been shown the single truth that held them all together.

"Teach me, father," he said, and he sat down on the earth like a beginner.

And his father, pleased that the pride had finally made room for wonder, began the lesson that would lead, day by day, to the greatest sentence in all the forest's wisdom — that the deepest self of everything is one. This is the knowing Krishna promised Arjuna: learn this, and there is nothing left to learn.