The American Church Dictionary and Cycopedia
The figure of an eagle is often used in the Church as an emblem to symbolize the flight of the Gospel message over the world. To this end the lectern from which the Holy Scriptures are read is generally constructed in the form of an eagle with outstretched wings on which the Bible rests. It is usually made of polished brass, but sometimes carved in wood. The eagle is also used as an emblem of the Evangelist St. John, who more than any other of the Apostles, was granted a clearer insight into things heavenly, as may be seen from the Gospel, Epistles and the Revelation which he was inspired to write.
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Miller, William James. Entry for 'Eagle'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/e/eagle.html. 1901.