成唯識論述記 6.215

6.215

述曰：謂於一切法若事若理，信忍皆是。《對法》云：於實有體起忍可信。古師依此，謂此四諦體實有也。今此中言，若信虛空，此是何等？體非實故，亦非諦故。為信虛空，即此攝故，但可總言若理若事，空雖體無，有空理故。

The Commentary states: This means that regarding all phenomena, whether phenomena as facts or as principle, belief and endurance are both this. The Abhidharmasamuccaya states: "Regarding that which has real existence, generating belief consisting in endorsement." Ancient masters relied on this to claim that the four noble truths are real existents in substance. Now it is asked here: if one has faith in space, what kind of thing is this? For its substance is not real, nor is it a noble truth. Because faith in space is subsumed by this, one can only speak in general terms of either principle or facts; although space is nonexistent in substance, the principle of space exists.