Do not make irresponsible remarks
From China Digital Space
不要乱说话 (bú yào luàn shuō huà): do not make irresponsible remarks
From the Southern Metropolis Daily:
On August 27, 2010, Pizhou municipal education bureau sent a red-lettered document (i.e., important directive) to all secondary and private schools. The document states that since last year, Pizhou city has already had three teachers detained for disseminating falsehoods online. All teachers were instructed to "pay attention to one's image, be mindful of politics, speak about the big picture, refrain from doing things that are not to be done, and from irresponsibly remarking on things which ought not to be remarked upon.” This incident has been dubbed as “restricted Web gate” by netizens. The authenticity of the document was confirmed on the 13th by Pizhou municipal education bureau director Gao Fuxin.