一切經音義 21.432

21.432

性爾（爾猶如此也如此即是印可之言故珠叢曰尒謂言相然也）。

Naturally so (爾 [er] is like 'thus'. 'Thus' is an expression of affirmation; hence the Zhucong states: '爾 [er] means an utterance of assent').