Biography of Zeng Guofan

What kind of person was Zeng Guofan? A famous minister who pulled back from the brink at the end of the Qing Dynasty, or a butcher who suppressed the Taiping Heavenly Kingdom revolutionary movement? A person who has been gone for more than a hundred years, why is he still receiving endless praise and abuse? What kind of lessons can his character, officialdom, family management, and learning give to future generations?