Err wait, apparently I'm just subconsciously regurgitating VIL so I might as well have quoted him:

The fundamental law of revolution, which has been confirmed by all revolutions and especially by all three Russian revolutions in the twentieth century, is as follows: for a revolution to take place it is not enough for the exploited and oppressed masses to realise the impossibility of living in the old way, and demand changes; for a revolution to take place it is essential that the exploiters should not be able to live and rule in the old way. It is only when the “lower classes” do not want to live in the old way and the “upper classes” cannot carry on in the old way that the revolution can triumph. This truth can be expressed in other words: revolution is impossible without a nation-wide crisis (affecting both the exploited and the exploiters). It follows that, for a revolution to take place, it is essential, first, that a majority of the workers (or at least a majority of the class-conscious, thinking, and politically active workers) should fully realise that revolution is necessary, and that they should be prepared to die for it; second, that the ruling classes should be going through a governmental crisis, which draws even the most backward masses into politics (symptomatic of any genuine revolution is a rapid, tenfold and even hundredfold increase in the size of the working and oppressed masses—hitherto apathetic—who are capable of waging the political struggle), weakens the government, and makes it possible for the revolutionaries to rapidly overthrow it.