大方廣佛華嚴經入法界品四十二字觀門 1.30

1.30

囉他（二合上）字時，入逆生死輪智道場般若波羅蜜門，悟一切法執著義性不可得故。

When pronouncing the letter RTHA (conjunct), one enters the perfection of wisdom door of the bodhimaṇḍa of knowledge reversing the wheel of birth and death, because one realizes that the nature of adhering to meanings (artha) in all dharmas cannot be apprehended.