Video Information: Acharya Prashant speaking at a Shabdyog session at 'The Rishikesh Tour', on 24th February 2016.
Verse from Kena Upanishad:
He by whom it (Brahman) is not thought, by him it is thought;
he by whom it is thought, knows it not.
It is not understood by those who understand it, it is understood by those who do not understand it.