It is in the quiet mind that the true observation and knowledge come.
A quiet mind is a mind that does not get disturbed, is not restless and always vibrating with the need of mental action.
It is the first secret of Yoga, to maintain the inner calm always and from that calm to meet everything.
SRI AUROBINDO – LETTERS ON YOGA
The Complete Works of Sri Aurobindo – Volume 29 – Chapter 3 – Published by Sri Aurobindo Ashram Publication Department – Pondicherry – India