大方廣佛華嚴經入法界品四十二字觀門 1.34

1.34

訶嚩（二合）字時，入觀察一切眾生堪任力遍生海藏般若波羅蜜門，悟一切法可呼召性不可得故。

When pronouncing the letter HVA (conjunct), one enters the perfection of wisdom door of the ocean treasury universally producing the capacity and strength of all sentient beings, because one realizes that the summonable nature (hvāna) of all dharmas cannot be apprehended.