Shido Bunan Zenji (1603–1676)

Shido Bunan Zenji was a Japanese Zen master. He wrote much poetry and prose. Bunan lived an austere and simple life as a lay innkeeper, practising Zen under the guidance of National Teacher Gudo. He did not become a monk until late in life. He led his Zen meditation group with a few very simple rules. His most famous student, Shoju Rojin, was the root teacher of Hakuin Ekaku Zenji. For sayings by Bunan, see The Original Face, edited by Thomas Cleary.

See this page for some writings praising Bunan's style. 

While living
Be a dead man,
Be thoroughly dead -
And behave as you like,
And all's well.

Bunan