"If the mind falls asleep, awaken it. Then if it starts wandering, make it quiet. If you reach the state where there is neither sleep nor movement of mind, stay still in that, the natural (real) state."
Ramana Maharshi was an Indian Hindu sage and spiritual teacher associated with Advaita Vedanta and self-inquiry practice. He lived at Arunachala in Tiruvannamalai, where his teachings attracted seekers from India and abroad.