atra kāraṇam āha vikalpā ityādi / yat yasmāt nāmasaṃsargabhājo vikalpā vācakāś ca śabdā viśvakalpāḥ nānāprakārāḥ abhedini niraṃśaikasvabhāvavastuni yathābhyāsaṃ vartante /
Here [the author] states the reason [by saying] "vikalpāḥ" etc.: because conceptual constructs that are associated with names and expressive words of various kinds operate through habituation with reference to an undifferentiated entity (vastu) which is partless and of singular nature.