The Mēnōg-ī Khrad (ˈmeːnoːgiː xrad) or Spirit of Wisdom is one of the most important secondary texts in Zoroastrianism written in Middle Persian.
Also transcribed in Pazend as Minuy-e X(e/a)rad and in New Persian Minu-ye Xeræd, the text is a Zoroastrian Pahlavi book in sixty-three chapters (a preamble and sixty-two questions and answers), in which a symbolic character called Dānāg (lit., “knowing, wise”) poses questions to the personified Spirit of Wisdom, who is extolled in the preamble and identified in two places (2.95, 57.4) with innate wisdom (āsn xrad).
According to the preamble, Dānāg, searching for truth, traveled to many countries, associated himself with many savants, and learned about various opinions and beliefs.
For example, there are passages on keeping quiet while eating (2.33-34); on not walking without wearing the sacred girdle (kostī) and undershirt (sodra; 2.35-36); on not walking with only one shoe on (2.37-38); on not urinating in a standing position (2.39-40); on gāhānbār and hamāg-dēn ceremonies (4.5); on libation (zōhr) and the yasna ceremony (yazišn; 5.13); on not burying the dead (6.9); on marriage with next of kin (xwedodah) and trusteeship (stūrīh; 36); on belief in dualism (42); on praying three times a day and repentance before the sun, the moon, and fire (53); on belief in Ohrmazd as the creator and in the destructiveness of Ahreman and belief in *stōš (the fourth morning after death), resurrection, and the Final Body (tan ī pasēn; 63).
The oldest surviving manuscripts there are L19, found in the British Library, written in Pazend and Gujarati, which is believed to date back to 1520.