The Mirror of Zen is a text that was written by a teacher named So Sahn. He is one of the most revered Zen Masters in the history of Seon Buddhism. He was a Korean teacher and he tried to distill Zen teachings from over 50 sutras into a container that could easily be understood.
So Sahn lived in the 1500s. He became a monk at the age of 21 and dedicated himself to lifelong study. He lived in a time of great peril, when Korea was at war with Japan.
In these days there was some debate over whether practice should be centered on meditation or sutra study. Several different branches of Buddhism arose because of this debate, putting different levels of emphasis on different aspects of the Dharma. There were some saying we should just study the words of the Buddha and we really don’t have to practice ourselves. There are others who say that we just have to practice, that studying in any way is a distraction from our practice, we just have to sit like the Buddha did.
It’s with this in mind that he wrote “The Mirror of Zen,” which is at once a study of core Zen concepts and also a practice manual. It’s a tiny little book. It can be read in just a couple of hours, but it has incredible depth.