Say “Holy Spirit,” and most imagine a dove or tongues of fire gently descending. But the Celts envisioned something wilder: a goose in flight—honking across the sky, untamed and impossible to ignore.

For a majority of Christians, the Holy Spirit is a third of the Trinity, and memorizing verses about the spirit of God are encouraged to do. "The Triune God", also known as the Father, Son, and the ...