kṣaṇāvasthitarūpaṃ hi vastu kṣaṇikamucyate / sthirarūpasamākrāntaṃ vastvevākṣaṇikaṃ punaḥ //
A thing whose form exists [only] for a moment is called 'kṣaṇika' [momentary], while a thing possessed of a stable form is conversely called 'akṣaṇika' [non-momentary].