That which is the mover thereof, i.e. of the independent source of action, is called hetu or cause, as well as kartā or agent.,
Thus कारयति he causes to be made, हारयति he causes to be taken. When hetu is employed as agent the verb is put in the causative form 3.1.26.
The force of the word च is to give both names to the mover of an agent, viz., Hetu and karta: otherwise by sutra 1 of this Chapter only one name would have been given.,