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Shiavault - a Vault of Shia Islamic Books Nahjul Balagha Part 1, The Sermons Sermon 158: Allah deputed the Prophet (S) at a time…. About the Holy Prophet and the Holy Qur'an ومن خطبة له (عليه السلام) ينبّه فيها على فضل الرسول الاعظم، وفضل القرآن، ثم حال دولة بني أميّة Allah deputed the Prophet (S) at a time when there had been no prophets for some time. People had been in slumber for a long time and the twist of the rope had loosened.
The Prophet came with (a Book containing) testification to what (books) were already there and also with a light to be followed. It is the Qur'an. If you ask it to speak it won't do so; but I will tell you about it. Know that it contains knowledge of what is to come about, stories of the past, cure for your ills and regulation for whatever faces you.
A part of the same sermon about the autocracy of the Umayyads منها: في دولة بنى أمية At that time there will remain no house or tent but oppressors would inflict it with grief and inject sickness in it. On that day no one in the sky will listen to their excuse and no one on the earth will come to their help. You selected for the governance (caliphate) one who is not fit for it, and you raised him to a position which was not meant for him.