The past has passed away
future has not arrived 
present does not remain, 
nothing is reliable.
everything must change.

Ryōkan Taigu (1758 CE-1831 CE), Ryōkan Taigu (良寛大愚) was a quiet and unconventional Sōtō Zen Buddhist monk who lived much of his life as a hermit. Ryōkan is remembered for his poetry and calligraphy, which present the essence of Zen life.