Wu-men Hui-k'ai (1183–1260). Chinese Buddhist. Successor of Wu-tsu Fa-yen in the Yang-ch'i line of Rinzai, although in an offshoot represented in the teacher Yüeh-an Shan-kuo, whose dharma-successor (hassu) he became. He was also taught by Yueh-lin, who set him the mu kōan; after six years he had not progressed through it, and he resolved not to sleep until he did so. In a desperate state, he heard the midday drum, and reached enlightenment.
From: http://www.encyclopedia.com/doc/1O101-WumenHuikai.html
Ten thousand flowers in spring, the moon in autumn,a cool breeze in summer, snow in winter.If your mind isn't clouded by unnecessary things,this is the best season of your life.
--from The Enlightened Heart, edited Stephen Mitchell