You are That
Svetaketu, a young boy asked his father about the Supreme.
"Believe me, my son," said Svetaketu’s father. "An invisible and subtle essence is the Spirit of the whole universe. That is Reality. That is Atman. Thou Art That."
"Explain more to me, father," said Svetaketu.
"So be it, my son. Place this lump of salt in water and return here tomorrow morning."
Svetaketu did as he was instructed.
In the morning, his father asked him to take out the lump of salt from the water. Svetaketu looked into the water, but could not find the salt, as it had dissolved.
His father then said, "Taste the water and tell me how it is.”
"It is salty" replied Svetaketu.
"Look for the salt again" the father addressed.
"I cannot see the salt, father. I only see water that tastes salty" replied Svetaketu.
Svetaketu’s father then said, "In the same way my son, you cannot see the Sprit. But in truth it is here. An invisible and subtle essence is the Spirit of the whole universe. That is Reality. That is Truth. Thou Art That (Twam Tat Asi).”