Sri Ramana Maharshi:

All the texts say that in order to gain release [Liberation] one should render the mind quiescent; therefore their conclusive teaching is that the mind should be rendered quiescent.
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Question:

Are there no other means for making the mind quiescent?

Sri Ramana Maharshi:

Other than [Self] inquiry, there are no adequate means.
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Above quotes taken from Nan Yar? (Who Am I?), written by Sri Ramana Maharshi