And a rule fixing the meaning of Tense (kāla) and upasarjana (sequence) is equally (unnecessary, and need not be taught).,
Here Panini controverts the opinion of those grammarians who would even define time and sequence. Thus there were authors who defined pluperfect as a tense relating to time hundred years past, others said a thousand years past, &c. Panini declares that these are redundant definitions and reprehensible, for the same reason as given in the previous sutra.
To give another example. Thus अद्यतनः कालः or the period of the current day, has been thus defined by some Acharyas:- \The period of time beginning from the point when one rises (or ought to rise) from his bed, according to the law, and ending with the point when one goes to bed, according to rule, is called adyatana.\ Others say \from midnight to midnight is the period of the current day.\ Similarly others have explained the 'upasarjana' to mean \that which is not the principal word in a compound is called upasarjana.\ The sage Panini has not thought it worth his while to define such word as upasarjana, in as much as their sense is well understood by all as a matter of usage. Thus common people who have never heard of grammar, also know the correct use of tenses; they say: \This is to be done by me to-day, this wiil be done by us to-morrow, this was done by us yesterday.\
Similarly common people also know the use of the word upasarjana, for they say:- \वयमत्र गृहे ग्रामे वा उपसर्जनम्\ 'we are secondary or unimportant persons in this house or village,' meaning that they are not the principal persons. Therefore that which is valid according to the usage of the people is needless to be taught.
Why was not this sutra included in the last? What is the necessity of making a separate rule of this? The answer is that it is an illustrative sutra, and does not exhaust the subject. There are other rules made by former sages which are also not taught by Panini. Thus the following rules of old Rishis are not taught herein, they being supposed to be well-known. \A Bahuvrihi compound connotes ownership.\ \In Dvanda compounds the sense of both the members of a compound are principal\ \In Avyayibhava compounds the sense of the prior word is the principal\ &c.,