Marxism remains the "guiding ideology" and "fundamental principle" for Chinese Communist Party and "the soul of social ideologies." In March 2007, a professor from the Party School of the Communist Party of China published a paper entitled "Important Issues for Future In-depth Studies on Building a Harmonious Socialist Society." Hu Jintao set forth the goal of a harmonious society at the Party’s Sixth Plenary Session held in October 2006.