Zen Buddhist teacher and calligrapher
Gesshū Sōko (1618–1696) was a Japanese Zen Buddhist teacher and a member of the Sōtō school of Zen in Japan. He studied under teachers of the lesser known, and more strictly monastic, Ōbaku School of Zen and contributed to a reformation of Sōtō monastic codes. As a result, he is sometimes given the title "The Revitalizer".
He is known for his calligraphy as well as his poetry, including his death poem: 
Inhale, exhale ;br ;
Forward, back ;br ;
Living, dying: ;br ;
Arrows, let flown each to each ;br ;
Meet midway and slice ;br ;
The void in aimless flight -- ;br ;
Thus I return to the source.
Gesshū Sōko passed Dharma transmission to Zen Master Manzan Dōhaku who went on to restore the strong master-disciple bond in Sōtō Zen.
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