Shvetaketu had come home from many years at school, and he thought he knew everything.

He could recite the hymns. He could argue about the rituals. He carried himself the way clever young men sometimes do, as if knowledge were a medal pinned to the chest. But his father, the sage Uddalaka, watched him quietly and saw that something important was still missing.

One morning Uddalaka led his son to the great banyan tree at the edge of their hermitage. Its branches spread wide enough to shade a hundred people, and roots dropped down from above like the legs of a patient giant.

"Bring me a fruit from that banyan," said Uddalaka.

Shvetaketu reached up and plucked one of the small figs. "Here, Father."

"Break it open. What do you see?"

Shvetaketu split it with his thumbnail. "Seeds, Father. Tiny seeds."

"Take one. Break that open. What do you see now?"

Shvetaketu pinched a single seed — smaller than a grain — and pressed it until it opened. He peered close. He turned it in the morning light. He frowned.

"Nothing, Father," he admitted at last. "There is nothing inside. It is too small. I can see nothing at all."

Uddalaka nodded slowly, as if his son had finally said something true.

"And yet," he said, lifting his hand toward the enormous tree above them, its leaves whispering in the breeze, its branches dark with a thousand figs, its roots gripping half the riverbank — "and yet out of that nothing you could not see, all of this has grown. The mighty banyan was hidden inside that speck. The trunk, the shade, the fruit, the next forest of banyans after it — all of it was there, in something so subtle your eyes could not find it."

Shvetaketu stared at the broken seed in his palm, then up at the vast tree.

"That subtle essence you could not see," said his father gently, "that is the Self of all this world. That is what everything is made of. And, Shvetaketu —" he placed a hand on his son's shoulder — "tat tvam asi. That thou art. You, too, have grown from that unseen seed."

For the first time in years, Shvetaketu had no clever answer. He simply closed his hand around the seed and stood very still, beginning, at last, to understand.