“The simplest meaning of the word sutra is “thread”. A sutra is, so to speak, the bare thread of an exposition, the absolute minimum that is necessary to hold it together, unadorned by a single “bead” of elaboration. Only essential words are used. Often, there is no complete sentence-structure. There was a good reason for this method. Sutras were composed at a period when there were no books. The entire work had to be memorized, and so it had to be expressed as tersely as possible Patanjali’s Sutras, like all others, were intended to be expanded and explained. The ancient teachers would repeat an aphorism by heart and then proceed to amplify it with their own comments, for the benefit of their pupils. In some instances these comments, also, were memorized, transcribed at a later date, and thus preserved for us.”
From the Translators’ Foreword.
