Khandogya-Upanishad: Seventh Prapathaka, Thirteenth Khanda

1. “Memory, (smara) is better than ether. Therefore where many are assembled together, if they have no memory, they would hear no one, they would not perceive, they would not understand. Through memory we know our sons, through memory our cattle. Meditate on memory.”

2. “He who meditates on memory as Brahman, is, as it were, lord and master as far as memory reaches—he who meditates on memory as Brahman.”

“Sir, is there something better than memory?”

“Yes, there is something better than memory.”

“Sir, tell it me.”