Comment by inkyoto

Classical Chinese (Ancient or Old Chinese – multiple terms are used), the language the quote was written in that predates Middle Chinese and, by extension all modern Chinese languages, had a very different grammar with many features of it having all but disappeared from all Chinese languages. Classical Chinese texts are incomprehensible to a modern Chinese person who has not invested sufficient amounts of time and effort into completing Classical Chinese studies first.

There is a book, «Classical Chinese for everyone: a guide for absolute beginners» by Bryan W. van Norden that is easy to read and gives a gentle introduction into Classical Chinese.

The old grammar and vocabulary coupled with the Chinese style of writing metaphorically with an abundant application of allusions and with the same Chinese characters having multiple unrelated meanings, makes Ancient Chinese texts very terse and notoriously difficult to understand even for the educated Chinese people.