Gesshū Sōko (1618–1696) was a JapaneseZenBuddhist teacher and a member of the Sōtō school of Zen in Japan. He studied under teachers of the lesser known, and more strictly monastic, Obaku 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:
Arrows, let flown each to each
Meet midway and slice
The void in aimless flight --
Thus I return to the source.