If a man writes a book, let him set down only what he knows. I have guesses enough of my own.

If a man writes a book, let him set down only what he knows. I have guesses enough of my own.

人若写书，就当写他所知道的。我自己的猜测已经够多了。

-- Johann Wolfgang von Goethe 约翰·沃尔夫冈·冯·歌德