voice in the wilderness

Meanings

1. A person, publication, or other source of assertions that expresses an opinion, doctrine, or point of view which is ignored or rejected by almost all others; the actual utterance of an unpopular opinion, doctrine, or point of view.
2. An influential religious personage, especially one who makes prophetic utterances.

Etymology

From the Biblical accounts of John the Baptist, as in the Gospel of Mark, 1:2–4: "Behold, I send my messenger before thy face, which shall prepare thy way before thee. The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. John did baptize in the wilderness." (King James Version).