The tides of history run deep This desire for completeness, truth and comprehensive evidence is the reason why apart from direct and immediately available materials such as oral histories, personal interviews and the like, historians are particularly fond of all kinds of written materials such as files, personal letters, private diaries and so on.
求全、求真，事事講究證據，因此在立即可得的直接資料如口述歷史、當面採訪之外，歷史學者尤其看重的，則是各種文字資料，譬如各種檔案、私人信函、私密性日記手札等等。