仁王護國般若波羅蜜多經疏 2.511

2.511

解曰：如陽炎者，指事明也。春陽發生，郊野氣動，若謂實有，轉近轉無；若謂今無，能誑渴者。故有為法體非有無，示其不實如陽炎矣。從此第五明相待假。於中分二：一明觀待假、二明觀待假。且初第一明觀待假。

The commentary explains: 'Like a mirage' clarifies this by pointing to an actual phenomenon. When the spring sun begins to shine, the vapor moves across the fields: if one considers it to truly exist, the closer one approaches, the more it disappears; if one considers it now to be nonexistent, it is capable of deceiving the thirsty. Therefore, the substance of conditioned phenomena is neither existent nor nonexistent; showing that they are unreal is like a mirage. Hereafter, the fifth part explains the designation of relativity. In this there are two parts: first, explaining the designation of comparative relativity; second, explaining the designation of formal relativity. First, the first explains the designation of comparative relativity.