Mao believed in keeping the society in a state of “permanent revolution.” This was partially behind his destructive “cultural revolution” which led to so much purging of the intelligentsia. Consider that Capitalism keeps a society in a state of permanent “revolution” but with respect to markets. Competition is constantly causing revolutions in markets. In both types of “cultural revolution” life is not secure, and in a constant state of flux.
Probably “permanent revolution” for Mao had to do with the tendency of societies to lapse back into the exploitation of labor.