Sage

Bhagavan explains: "One who talks advaita without actual experience of that truth is just the same as a dvaitin [a dualist]. Neither speech nor mind has any access to that supreme state. He that abides in that state has no doctrine whatever." These essential passages are from Sri Ramana Paravidyopanishad
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The sage does not 'know' the Self, because he is the Self. ~ Sri Ramana Maharshi