Gesshū Sōko  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 Forward, back Living, dying: Arrows, let flown each to each Meet midway and slice The void in aimless flight -- 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.