When was Mao Zedong's Unity, Tension, Serious Liveliness published?

1937 1 The CPC Central Committee decided to rename "China People's Anti-Japanese Red Army University (Hongda)" as "China People's Anti-Japanese Military and Political University (Kangda)", and Mao Zedong recommended Lin Biao as the president. He personally became the political commissar of the Anti-Japanese War and the chairman of the Education Committee, which shows that he attached great importance to the construction of our military academies and the training of military personnel. In the first half of this year, Mao Zedong wrote an inscription for the teachers of Kangda University: "Loyal to the Party's educational cause", and in view of the ideological situation that some comrades were uneasy about teaching and wanted to go to the front line to fight, he emphasized that "teachers are cadres of cadres" and carried out a lot of hard and meticulous ideological work. After the outbreak of War of Resistance against Japanese Aggression, although Kangda was in a difficult situation, under the personal care of Mao Zedong, Kangda General School not only continued to run schools, but the Eighth Route Army and the New Fourth Army also established 12 branch schools in various base areas. Mao Zedong wrote an inscription for Kangda: "firm and correct political direction, hard and simple work style, flexible strategy and tactics" and "unity, tension, seriousness and vividness", and reiterated the contents of the inscription three times in March, June and May of the following year from 65438 to 0938, making it the educational policy and school spirit of all colleges and universities in the future, which played a long-term guiding role in the construction of our military colleges and universities.