The Upanishads, Part 1 (SBE01): Khândogya Upanishad: VII, 19
The Upanishads, Part 1 (SBE01), by Max Müller, [1879]
1. 'When one believes, then one perceives. One who does not believe, does not perceive. Only he who believes, perceives. This belief, however, we must desire to understand.'
'Sir, I desire to understand it.'