What is the meaning of the saying, "Do not seek to be prepared for others, but check yourself if you are not enough"?

1. It means that we should not be too hard on others, but we should be too hard on ourselves.

2. This quote is from "Shangshu - Yixun" (尚书-伊训).

3. The original text reads: "Woo-hoo! The late king cultivated the human discipline, from the admonition of the order, the first people if the time. Residence in the upper Keming, for the lower Kizhong, and people do not seek to prepare, check the body if less than, so that there are ten thousand states, Zi but hard!

Expanded content:

Shangshu, the earliest book title for the Book, written in about the fifth century before the traditional Shangshu (also known as the "present Shangshu") by the Fusheng passed down. It has been proved to be the remaining works of the ancient culture of "Three Graves and Five Classics".

"Shangshu" is listed as one of the important core Confucian classics, "Shang" means "on", "Shangshu" is the book of the ancient times, which is a compilation of historical documents and some of the writings tracing the ancient deeds in China.

References:

Baidu Encyclopedia entry? Shangshu (ancient Chinese book)