An instant realization
Sees endless time.
Endless time is as one moment.
When one comprehends
The endless moment
He realizes the person
Who is seeing it.

Wumen Huikai (1183 CE-1260 CE), Wumen Huikai was a Chinese Chán (Japanese: Zen) master during China‘s Song period. He is most famous for having compiled and commentated the 48-koan collection The Gateless Barrier.