To better understand the Persian literature, knowing mystical expressions is necessary because the mysticism and mystical thought is the spirit of Persian literature. Expressions such as “Fath”, “Fotuh” and Fath-e-bab have been frequently used in different literary works. In this research, regarding their various meanings, looked up in literary texts, we will briefly follow the changes in the meanings and interpretations of the expressions “Fath”, “Fotuh” and Fath-e-bab” through distinguished mystical and literary works from the beginning to their growth and again their descend. In some works, “Fath”, “Fotuh” and Fath-e-bab have been used interchangeably, or one has been used for the others.
The word “Fath” was originally taken from the Qur’an by mystics and literati and turned to a loaded remark. In fact, the various significances of these mystical expressions originated from the words of Qur’an as seeds which gradually became a fruitful tree of huge foliage in the works of Mowlana.