I have a medicine
Called elixir of mind;
For years it’s been refined
In the oven of afflictions
Till I recognized its
Unchanging color in the matrix
Shining with radiance,
Illuminating the universe.

Dongshan Liangjie (807 CE-869 CE), Dongshan Liangjie was a Chan Buddhist monk of ninth-century China. He founded the Caodong school (Chinese: 曹洞宗), which was transmitted to Japan in the thirteenth century by Dōgen and developed into the Sōtō school of Zen.