大方廣佛華嚴經疏 59.18

59.18

第六妙月長者，幻智智光善友。真智廓妄，名為淨智。後智照法，名為智光。能淨能光，若秋空滿月，故名妙月。

Sixth, regarding the elder Sucandra (Wondrous Moon), the good friend of illusory-wisdom wisdom light: true wisdom clearing away delusion is called pure wisdom. Subsequent wisdom illuminating dharmas is called wisdom light. Able to purify and able to illuminate, like the full moon in the autumn sky, he is named Sucandra.