44Cambrensis, Giraldus. The Topography of Ireland. (original: 1187) in The Historical Works of Giraldus Cambrensis, Thomas Wright, ed. London: George Bell and Sons, 1882. 99-100.
Of this (apparently lost) "Book of Kildare," Giraldus wrote: "Among all the miracles in Kildare, none appears to me more wonderful than that marvelous book which they say was written in the time of the Virgin [St. Brigit] at the dictation of an angel. It contains the Four Gospels according to St. John, and almost every page is illustrated by drawings illuminated with a variety of brilliant colours...you will find them so delicate and exquisite, so finely drawn, and the work of interlacing so elaborate, while the colours with which they are illuminated are so blended, and still so fresh, that you will be ready to assert that all this is the work of angelic, and not human, skill. The more often and closely I scrutinize them, the more I am surprised, and always find them new, discovering fresh causes for increased admiration."
This description of the "Book of Kildare" has invited comparisons with, and indeed suggests that Giraldus was actually viewing, the Book of Kells.
Giraldus' text may be read in its entirety here.
The description of Brigid's shrine was composed by Cogitosus in the seventh century. (Minehan, Rita. Rekindling the Flame: A Pilgrimage in the Footsteps of Brigid of Kildare. Kildare: Solas Bhride Community, 1999. 13.)