Zen-sitting is the way of perfect tranquility: 
Inwardly not a shadow of perception, 
Outwardly not a shade of difference 
Between phenomena.  
Identified with yourself, 
You no longer think, 
Nor do you seek enlightenment 
Of the mind or the shaking off the
Burden of illusions.  
You are a flying bird with 
No mind to twitter, a mountain 
Unconscious of the others rising around it.

Meihō Sotetsu (1277 CE-1350 CE), Meihō Sotetsu was a Japanese Sōtō Zen monk who lived during the late Kamakura period and early Muromachi period, often considered the second most important figure in Sōtō Zen after Eihei Dōgen, for twenty-nine years and ultimately became his primary successor.