Quotation from Chairman Mao: Historical experience is noteworthy

毛主席语录:历史的经验
Mao zhuxi yulu: Lishide jingyan...
Quotation from Chairman Mao: The historical experience...
1968, June
Beijing chubanshe (北京出版社)
77x53 cm.
BG E13/553

The quotation in full:
Historical experience is noteworthy. A line or a view must be constantly and repeatedly explained. It will not do to explain it only to a few; it must be made known to the broad revolutionary masses.