Corde natus ex parentis (Divinum mysterium)

Thomas E Mercer, 1943-2017, was an organist active in Lancaster County, Pennsylvania.
https://www.findagrave.com/memorial/178990475

This piece was composed ca. 1980 as a hymn introduction for use on the W Zimmer & Sons organ at First English [language] Lutheran Church in Columbia, Pennsylvania, now defunct. The organ, despite its size of fewer than 20 ranks, had a pedal 2’ flute. Perhaps it was a desire to justify this extravagance that led to the nasty double pedal in this piece.

The manuscript, not under copyright, is attached.