Ruess and McCandless remind Krakauer of Ancient Irish Monks because they share a similar spirit of adventure, independence, and desire for solitude in the wilderness. Like the Irish monks who sought isolation and spiritual enlightenment in remote places, Ruess and McCandless also sought solitude and a connection with nature in their respective journeys. Krakauer likely sees parallels between their experiences and the experiences of the Irish monks, who ventured into the wilderness in search of a deeper understanding of themselves and the world around them.