2. This sentence comes from Shangshu Yixun.
3. The original text is: Woo! The former king advocated human discipline, from remonstration to remonstration, so should the ancestors. It is difficult to be loyal to others, not to prepare with others, not to have a physical examination, and such a nation has it!
Extended content:
The earliest title of Shangshu was Shu, which was written in the first five centuries. The traditional Shangshu (also known as Jinwen Shangshu) was handed down by Fu Sheng. Textual research is the legacy of "Three Tombs and Five Classics" in ancient culture.
Shangshu is listed as one of the important core Confucian classics, and "Shang" means "Shang". Shangshu is an ancient book, a compilation of China's ancient historical documents and some works tracing back ancient deeds.
References:
Baidu encyclopedia entry? Shangshu (China Ancient Books)