Milarepa (1052-1135) who was famously known as a murderer when he was a young man, before turning to Buddhism: https://en.wikipedia.org/wiki/Milarepa Milarepa meditated in mountain retreat and nettles turned his skin green: “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 …