How authentic is the attribution of the book Nahj al-Balagha to Imam 'Ali ibn Abi Talib (may Allah be pleased with him)?

Question:
May Allah reward you, Honorable Shaykh. A questioner says: There is a book called Nahj al-Balagha attributed to 'Ali (may Allah be Exalted and Glorified be pleased with him). How authentic is its attribution to him? And is it recommended to read it?

Answer:
The book is not by 'Ali in the sense that 'Ali authored it. The one who authored it is a Rafidi, a Rafidi known as al-Sharif al-Radi or al-Murtada. He is the one who compiled it. He claims that he gathered in it the sermons of 'Ali ibn Abi Talib. It contains some of the words of 'Ali, but it is little. Most of it is the words of the Mu'tazilah and the Shi'ah.
They fabricated the sermons and added to them some of the words of 'Ali in order to promote it to the people. It contains Mu'tazilah theology, it contains denial of the divine decree, it contains cursing of the Companions, and it contains complaints on behalf of the People of the House. So it is a Shi'ah book. Nahj al-Balagha is a Shi'ah book.
One hundred percent. So the student of knowledge should beware of it, especially since it has exceptional eloquence and a style that affects the ignorant person.