question #1 Sahih Muslim 867c, Book 7, Hadith 57 : What is the significance of praising and lauding Allah in Islamic sermons?

He whom Allah guides aright, there is none to mislead him, and he who is led astray, there is none to guide him (aright), and the best of the talk is embodied in the Book of Allah. And the rest of the hadith is the same.