When a traveller returneth home, let him not leave the countries, where he hath travelled, altogether behind him; but maintain a correspondence by letters, with those of his acquaintance, which are of most worth.
旅行者归来后,不应把游历过的国家全然抛在身后,而应与所结识的最有价值的朋友保持书信往来。
— Francis Bacon · Essays · Of Travel —