SRI Nisargadatta 

Maharaj

from Wikipedia: born Maruti Shivrampant Kambli; 17 April 1897 – 8 September 1981) was an Indian guru of nondualism.

The publication in 1973 of I Am That, an English translation of his talks in Marathi by Maurice Frydman, brought him worldwide recognition and followers, especially from North America and Europe.

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On the Mind

The life force [prana] and the mind are operating [of their own accord], but the mind will tempt you to believe that it is "you". Therefore understand always that you are the timeless spaceless witness. And even if the mind tells you that you are the one who is acting, don't believe the mind. [...] The apparatus [mind, body] which is functioning has come upon your original essence, but you are not that apparatus.