This is a book written by Zuo, engraved by Shen Yu Meiyuan.
However, this painting hanging in Li Ka-shing's office was not written by the above two people. If we look closely at its brushwork, it is not difficult to conclude that this couplet is the calligraphy of Mr. Wu Xizai, a famous calligrapher and seal engraver in the late Qing Dynasty.
This pair of couplets in Li Ka-shing's office is so valuable! It turned out to be an antique, 200 years ago!