What did ernest hemingway say about huckleberry finn and what did he mean by that

Not so with Twain, who with "Huckleberry Finn," invented a new kind of American language. "All modern American literature comes from one book by Mark Twain called 'Huckleberry Finn,'" Ernest Hemingway famously declared in 1935. "It's the best book we've had. All American writing comes from that.