Marianus Scotus is the author of a commentary on the Psalms, so
precious that rarely was it allowed to pass beyond the walls of the
monastic library. His commentary on St. Paul's Epistles is regarded
as his most famous production. Herein he shows acquaintance with
Saints Jerome, Augustine, Gregory, and Leo, with Cassiodorus, Origen,
Alcuin, Cassian, and Peter the Deacon. He completed the work on the
17th May, 1079, and ends the volume by asking the reader to pray for
the salvation of his soul.

TRANSCRIPTION: In all the monasteries a vast number of scribes were
continually employed in multiplying copies of the Sacred Scriptures.
These masterpieces of calligraphy, written by Irish hands, have been
scattered throughout the libraries of Europe, and many fragments
remain to the present day. The beauty of these manuscripts is praised
by all, and the names of the best transcribers often find mention in
monastic annals. The work was irksome, but it was looked upon as a
privilege and meritorious.

It remains to speak of that glorious monument of the Irish monks, the
abbey of St. Gall, in Switzerland. It was here that Celtic influence
was most felt and endured the longest. Within its walls for centuries
the sacred sciences were taught and classic authors studied. Many of
its monks excelled as musicians and poets, while others were noted
for their skill in calligraphy and the fine arts. The library was
only in its infancy in the eighth century, but gradually it grew, and
eventually became one of the largest and richest in the world. The
brethren were in correspondence with all the learned houses of France
and Italy, and there was constant mutual interchange of books, sacred
and scientific, between them.