of humanity and God throughout history, and so, in that sense, Torah is a product of an ongoing revelation. Reconstructionist Judaism denies the notion of revelation entirely. Prophets Although the Nevi'im (the books of the Prophets) are considered divine and true, this does not imply that the books of the prophets are always read literally. Jewish tradition has always held that prophets used metaphors and analogies. There exists a wide range of commentaries explaining and elucidating those verses consisting of metaphor. Rabbinic Judaism regards Moses as the greatest of the prophets, and this view is one of the Thirteen Principles of Faith of traditional Judaism. Consistent with the view that revelation to Moses was generally clearer than revelation to other prophets, Orthodox views of revelation to prophets other than Moses have included a range of perspectives as to directness. For example, Maimonides in The Guide for the Perplexed said that accounts of revelation in the Nevi'im were not always as literal as in the Torah and that some prophetic accounts reflect allegories rather than literal commands or predictions. Conservative Rabbi and philosopher Abraham Joshua Heschel (1907–1972), author of a number of works on prophecy, said that, "Prophetic inspiration must be understood as an event, not as a process." In his work God in Search of Man, he discussed the experience of being a prophet. In his book Prophetic Inspiration After the Prophets: Maimonides and Others, Heschel references to continued prophetic inspiration in Jewish rabbinic literature following the destruction of the Temple in Jerusalem and into medieval and even Modern times. He wrote that "To convey what the prophets experienced, the Bible could either use terms of descriptions or terms of indication. Any description of the act of revelation in empirical categories would have produced a caricature. That is why all the Bible does is to state that revelation happened. How it happened is something they could only convey in words that are evocative and suggestive." Sikhism The Guru Granth Sahib is considered to be a divine revelation by God to the Sikh gurus. In various verses of Guru Granth Sahib, the Sikh gurus themselves state that they merely speak what the divine teacher (God) commands them to speak. Guru Nanak frequently used to tell his ardent follower Mardana "Oh Mardana, play the rabaab the Lord's word is descending onto me." In certain passages of Guru Granth sahib, it is clearly