It is the misfortune of the Irish that they rose prematurely, before the European revolt of the proletariat had had time to mature. Capitalism is not so harmoniously built that the various sources of rebellion can immediately merge of their own accord, without reverses and defeats. On the other hand, the very fact that revolts do break out at different times, in different places, and are of different kinds, guarantees wide scope and depth to the general movement; but it is only in premature, individual, sporadic and therefore unsuccessful, revolutionary movements that the masses gain experience, acquire knowledge, gather strength, and get to know their real leaders, the socialist proletarians, and in this way prepare for the general onslaught, just as certain strikes, demonstrations, local and national, mutinies in the army, outbreaks among the peasantry, etc., prepared the way for the general onslaught in 1905.

https://www.marxists.org/archive/lenin/works/1916/jul/x01.htm