首楞嚴義疏注經 4.171

4.171

「所以者何？富樓那！彼太虛空，日照則明，雲屯則暗，風搖則動，霽澄則清，氣凝則濁，土積成霾，水澄成映。」

"Why is this? Pūrṇa! In that vast empty space, when the sun shines it is bright; when clouds gather it is dark; when the wind stirs it is in motion; when the sky clears it is pure; when vapours congeal it is turbid; when dust accumulates it becomes a haze; when water settles it reflects."