Voice in the Wilderness or "a lone voice in the wilderness" is an English idiom for someone who expresses an idea or opinion that is not popular or that the individual is the sole person expressing that particular opinion with the suggestion that the opinion is then ignored.
It is from the King James Bible, Matthew 3:3, Mark 1:3, Luke 3:4John 1:23 "... voice of one crying in the wilderness ..." and Isaiah 40:3 "The voice of him that crieth in the wilderness ...".
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