《管子·小问》
从前天子立在中央，地方千里，只要具备上述四条，怎么怕人民少呢？
昔者天子中立，地方千里，四言者该焉，何为其寡也？
In the past, the Son of Heaven was at the center and ruled over a realm of a thousand li. As long as he implemented the above four points, how could he fear that there were too few people?