He who goes to the grassy suburbs，taking enough food for three meals with him，comes back with his stomach as full as when he started.But he who travels a hundred li must grind flour enough for a night’s halt.And he who travels a thousand li must supply himself with provisions for three months.
“The further one goes，the more food one has to prepare.In the same way，the larger the wings are，the more air is needed.” —Kuo Hsiang