Art grows out of necessity, not out of fashion.
The boundary between physics and mathematics is not as clear-cut as we might think.
出自《海国图志》。圣人把天下当作一家,四海的人都是兄弟,所以对远方的人采取怀柔政策,以宾客的礼仪对待外国,这是王者的大度;普遍了解边塞民族的风俗,广泛博览全球风貌,这是智慧之人的远见卓识。