華嚴經探玄記 6.91

6.91

一釋名者，依言依行成德，稱言行不虛，故云真實。真實即行，持業得名。

First, explaining the name: by conforming to words and practice one accomplishes virtue, and because word and practice are not false, it is called 'truth.' Truth is itself practice; it obtains its name as a karmadhāraya compound.