etad uktaṃ bhavati samayo hi vyavahārārthaṃ kriyate, na vyasanitayā, tena yasyaiva saṅketavyavahārāptakālavyāpakatvam asti tatraiva samayo vyavahartṝṇāṃ yukto nānyatra /
This is what is meant: Convention is made for the purpose of usage, not out of mere attachment; therefore users can properly make Conventions only with regard to what is present at the time related to Convention and Usage, [and] not with regard to anything else