Revolution teaches

Apart from the revolution being a miracle, Lenin also describes it as a teacher:

A bad doctrine is splendidly rectified by a good revolution.

Life goes its own way, revolution teaches, taking in hand and shaking up the most inveterate pedants.

Experience in the struggle enlightens more rapidly and more profoundly than years of propaganda under other circumstances.

In a revolutionary epoch like the present, all theoretical errors and tactical deviations of the Party are most ruthlessly criticised by experience itself, which enlightens and educates the working class with unprecedented rapidity.

Revolution is a good teacher. It forces back on to the revolutionary track those who are continually going astray either from weakness of character or weakness of intellect.

Collected Works, Vol. 9, pp. 202, 203, 351-2, Vol. 10, p. 310, Vol. 12, p. 115.