一切經音義 81.154

81.154

慘舒（上蒼感反下暑余反言慘舒者則陰陽也陽則發生伸暢陰則肅煞閉藏既有昏明方辯寒暑當世界空洞之時未有日月淨天未降亦無身光所以寂然混同故慘舒不分也）。

Contracting and expanding (慘舒: the upper character is cāng + gǎn [cǎn]; the lower is shǔ + yú [shū]. "慘舒" refers to yin and yang: yang generates, grows, expands, and opens; yin chills, kills, closes, and stores. Once darkness and light exist, cold and heat can then be distinguished. When the world was an empty void, the sun and moon did not yet exist, and the pure heavens had not descended, nor was there bodily radiance; hence all was still and blended together, so contraction and expansion were indistinguishable).