“(…) there is no such thing as peace of mind. Mind means disturbance; restlessness itself is mind.(…) Examine closely and you will see that the mind is seething with thoughts. It may occasionally go blank, but it does it for a time and reverts to its usual restlessness. (…).”
Mind
Source: I am That, P.142.
Help us to complete the source, original and additional information
Nisargadatta Maharaj 138
Indian guru 1897–1981Related quotes

“For love of bustle is not industry – it is only the restlessness of a hunted mind.”
Nam illa tumultu gaudens non est industria sed exagitatae mentis concursatio.
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter III: On true and false friendship, Line 5.

Quoted, This Side of Paradise (1920)
Context: I simply state that I'm a product of a versatile mind in a restless generation — with every reason to throw my mind and pen in with the radicals. Even if, deep in my heart, I thought we were all blind atoms in a world as limited as a stroke of a pendulum, I and my sort would struggle against tradition; try, at least, to displace old cants with new ones. I've thought I was right about life at various times, but faith is difficult. One thing I know. If living isn't seeking for the grail it may be a damned amusing game.

“Desire is the memory of pleasure and fear is the memory of pain. Both make the mind restless. (…)”
Desire and fear
Source: "I am That." P.8

Source: A Mother's Advice to Her Son, 1726, p. 170