Unity as reflected in Fatimah's speech in Fadak

The speech given by Fatimah (pbuh) in the Mosque of Madinah, after the Prophet passed away and Imam Ali’s right to rule was usurped, is called the Fadak Khotbah. Fatimah’s intention behind presenting this speech, which is the sign of the oppressions against Shi’a and the mother of the Shiite Imams, is apparently regaining an orchard called Fadak inherited to her from the Prophet, but in reality her intention was clarifying many of divine truths and knowledge. This speech contains information about the unity of God, facts about the mission of the Prophet, and his attempts to invite people toward the unity of God and the implementation of Islam. This speech was recurrently narrated by the infallible Imams and by others directly connected to them and, as a result, is authoritative to us.