大方廣佛華嚴經隨疏演義鈔 18.20

18.20

疏「佛境如空故云廣大」者，即〈問明品〉云「如來深境界，其量等虛空，一切眾生入，而實無所入。」

Regarding the Commentary's statement, "The Buddha's realm is like empty space, hence it is called vast": the "Chapter on Inquiring into Clarification" states: "The profound realm of the Tathāgata / Has a measure equal to empty space. / All sentient beings enter it, / Yet in reality there is nowhere entered."