How is it to live according to spiritual teachings in solitary retreat & what do we know from people who did this in the past?

The Saint Milarepa lived according to the teachings of the Buddha: “The stunning lesson in impermanence gave Milarepa the final push he needed to follow Marpa’s command to meditate in mountain retreat. He stayed there for many years, until his clothes turned to rags, his bones protruded, and the nettles he ate turned his skin …