However, it cannot have been written by Guigo I, because it refers to several writings of thirteenth-century scholastic theology, as well as to Hugh of Balma's Viae Syon Lugent.
Part of it (Book II, chapters 1–5) was taken up nearly verbatim by the fourteenth-century Carthusian Ludolph of Saxony (d.1377) in his Vita Christi.
One of those who read Ludolph was Ignatius of Loyola, so indirectly, Guigo's thought entered early modern Catholic spiritual writing.
[1] Though it was known and used by a number of late medieval Carthusians, though (as well as Ludolph of Saxony it is used by Denis of Rijkel, and possibly Nicholas Kempf), it survives in only five manuscripts, so was clearly not widely read outside these circles.
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