Lukács discusses his experiences during the years of World War I, the Russian Revolution, and the short-lived Hungarian Soviet Republic, for which he served as the People's Commissar for Education and Culture.
There is a famous line in Lenin saying that "without revolutionary theory there can be no revolutionary movement." That is a very profound phrase. Theory serves for two things: to join together struggles that are apparently unrelated, and also as a compass in periods of crisis. It is what tells you whether in this precise moment you should be smashing up banks or standing in elections.