Phap Hien was a Vietnamese Zen master. He lived in the late 5th century and early the 6th century. When he was a young monk at the Phap Van Temple he met Vinitaruci (?-594) who was one of the successors of Seng-tsan, the Third Patriarch...
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ZAZEN MEDITATION GUIDE - Chapter 05. Garments for Sitting
Garments for Sitting You will not be comfortable with any kind of tight, heavy or hard fabric clothing when you sit in zazen. Therefore, any loose fitting garment made of fine, soft fabrics will be better in sitting. When you do zazen, wearing garment is much better than wearing nothing.