Starting out from the fact that the frustrated predominate among the early adherents of all mass movements and that they usually join of their own accord, it is assumed: 1) that frustration of itself, without any proselytizing prompting from the outside, can generate most of the peculiar characteristics of the true believer; 2) that an effective technique of conversion consists basically in the inculcation and fixation of proclivities and responses indigenous to the frustrated mind….  

The fact that both the French and the Russian revolutions turned into nationalist movements seems to indicate that in modern times nationalism is the most copious and durable source of mass enthusiasm, and that nationalist fervor must be tapped if the drastic changes projected and initiated by revolutionary enthusiasm are to be consummated.

Eric Hoffer, The True Believer (1951)