Works of Vedic "revelation" were deemed of higher authority in cases of doubt than the later works on religious and civil usage, called smṛiti or "memory," as embodying only the tradition derived from ancient sages.
We have now arrived at the third and last stage of Vedic literature, that of the Sūtras. These are compendious treatises dealing with Vedic ritual on the one hand, and with customary law on the other. The rise of this class of writings was due to the need of reducing the vast and growing mass of details in ritual and custom, preserved in the Brāhmaṇas and in floating tradition, to a systematic shape, and of compressing them within a compass which did not impose too great a burden on the memory, the vehicle of all teaching and learning. The main object of the Sūtras is, therefore, to supply a short survey of the sum of these scattered details. They are not concerned with the interpretation of ceremonial or custom, but aim at giving a plain and methodical account of the whole course of the rites or practices with which they deal. For this purpose the utmost brevity was needed, a requirement which was certainly met in a manner unparalleled elsewhere. The very name of this class of literature, sūtra, "thread" or "clue" (from siv "to sew"), points to its main characteristic and chief object—extreme conciseness. The prose in which these works are composed is so compressed that the wording of the most laconic telegram would often appear diffuse compared with it. Some of the Sūtras attain to an almost algebraic mode of expression, the formulas of which cannot be understood without the help of detailed commentaries. A characteristic aphorism has been preserved, which
