Who would deny the authenticity of the preaching and sayings of Hazrat Ali when it comes to Islamic History. In every stage of life that includes education, law and justice, smart decisions or even bravery, we can never deny the contributions made by our Caliph to resolve disputes in the challenging era ahead. Hazrat Ali's life and sermons are the great assets for the Muslim Ummah to make life easier with wise decisions without being distracted or having hassles to face.
Like every Caliphs and successors after Prophet Muhammad (P.B.U.H), we have precious knowledge-base to the Islamic way of life which is enlightened in various examples lead by Hazrat Ali.