We should say a little more about dharanis. Bodhisattvas, who are practitioners of the Great Vehicle, are expected to practice and obtain the power of dharanis. In Chapter One, “Introduction,” it says that there were eighty thousand Bodhisattvas in the congregation, and all of them “had obtained dharanis” (p. 1).
It is believed that the root of the word dharani in Sanskrit is the verb dhuti, which means “to keep or maintain.” Probably the original meaning of dharani was to keep or maintain something in the memory. It was necessary for people learning a sutra to be able to remember its words and recite them accurately.
Introduction to the Lotus Sutra