In the Nizari Ismaili interpretation of Shia Islam, the Imam is the guide and the intercessor between humans and God, and the individual through whom God is recognized. He is also responsible for the interpretation ("ta’wil") of the Quran. He is the possessor of divine knowledge and therefore the “Prime Teacher”. According to the “Epistle of the Right Path”, a Persian Ismaili prose text from the post-Mongol period of Ismaili history, by an anonymous author, there has been a chain of Imams since the beginning of time, and there will continue to be an Imam present on the Earth until the end of time. The worlds would not exist in perfection without this uninterrupted chain of Imamate. The proof ("hujja") and gate ("bāb") of the Imam are always aware of his presence and are witness to this uninterrupted chain.