I should have mentioned, William Sharp wrote about St Bridget under the name Fiona MacLeod.

St Bridget of the Isles

http://www.archive.org/stream/spiritualtales00macl/spiritualtales00macl_djvu.txt

Also, he mentions Iona, telling a tale from local folklore, about how Colum the Saint on Iona, and Arden a Druid of the Picts are talking theology, and wondering if the one's god is also the other's. Colum makes a good point Arden has to agree with, and likewise Arden makes a good point Colum has to concede. Finally they both agree, though for different reasons, and Colum says:

Therefore are we at one, O Ardan,
though we sail to the Isle of Truth
from the West and the East.
Let there be peace between us