Who said, “Love the sinner, hate the sin?”

It’s from St. Augustine. His Letter 211 (c. 424) contains the phrase Cum dilectione hominum et odio vitiorum, which translates roughly to “With love for mankind and hatred of sins.” The phrase has become more famous as “love the sinner but hate the sin” or “hate the sin and not the sinner” (the latter form appearing in Mohandas Gandhi’s 1929 autobiography).