Who is it?

"He was the country's leading novelist, philosopher, historian, educator, designer, literary crtic, architect, industrial management specialist, general, table tennis trainer, and agriculture experimenter...." Legends say, "He was a guerrilla general astride a white horse, carrying an enoumous sword, cutting a big tree down as if slicing soft bean curd." Another legend said, "He walked on water, turned grains of sand into rice, and crossed a large river riding on fallen leaves."

Who is it?