As in परमार्थ - paramārtha (’ultimate meaning’)

跛字門一切法第一義諦不可得故

波字門一切法第一義故

入跛字門，悟一切法勝義教故 (Xuanzang)

'Pa' is a gateway because all dharmas [cannot be grasped], are Ultimate Truth (paramārtha परमार्थ )    

PA is a door to the insight that all dharmas have been expounded in the ultimate sense (paramārtha)

The syllable PA is an opening because it points to the highest truth (paramārtha)

about all mental phenomena.

Jayarava