Just sit.
只管打坐。

Philosophers
Dōgen
Japanese Zen monk (1200-1253), founder of the Sōtō school. After studying in Song China under Tiantong Rujing, he taught shikantaza — "just sitting" — and wrote the Shōbōgenzō, admired by Watsuji and Steve Jobs.
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Source: 道元『普勧坐禅儀』『正法眼蔵』坐禅箴・坐禅儀巻 (天童如浄から継承した曹洞禅の核心スローガン)Verified