གྲུ་བཞི་སྒོ་བཞི་ཚད་དང་མཚན་ཉིད་ལྡན༔
It has four corners and four doors and possesses all the proper qualities and characteristics.
Longchen Nyingtik, Palchen Düpa, Kagyé, Tibetan Masters, Jamyang Khyentse Wangpo