King Francis said : `` There had never been another man born in the world who knew as much as Leonardo , not so much about painting , sculpture and architecture , as that he was a very great philosopher . '' Some twenty years after Leonardo 's death , Francis was reported by the goldsmith and sculptor Benevenuto Cellini as saying : `` There had never been another man born in the world who knew as much as Leonardo , not so much about painting , sculpture and architecture , as that he was a very great philosopher . ''