[5][6] Between 1109 and 1120 he also wrote the Meditations, 476 proverb-like sayings that characterized the wisdom of solitary, monastic life.

He was also a spiritual leader; Bernard of Clairvaux visited the Grande Chartreuse, probably in the 1120s, and wrote several letters to Guigo.

He was a close friend of St. Bernard of Clairvaux and of Peter the Venerable, both of whom wrote of Guigo's sanctity.

However, it cannot have been written by Guigo I, because it refers to several writings of thirteenth-century scholastic theology, including Hugh of Balma's Viae Syon Lugent.

It is acknowledged to be a late thirteenth-century text, with its author generally known as Guigo de Ponte.