Ren Hong-jun was one of the principal founders and leaders of the Science Society of China and had long been in charge of the journal Science (Ke Xue). In August, 2002, the impressive book The Ideal of a Patriotic Scientist——Collected Works of Ren Hong-jun, with 800 thousand words, was published. Today, as reading it once again, I am even more deeply moved and have the greatest esteem for the founders of the Science Society of China. In the present paper, five topics as follows are reviewed: (1) To be aware of what science is, (2) To understand the method of science, (3) To comprehend the spirit of science, (4) To take science as a national policy, and (5) To expound science and education, in order to interpret the tremendous efforts of Ren Hong-jun and his colleagues who worked on arousing the awareness about science in Chinese people, as well as to congratulate the Science Society of China on its hundredth birthday.