"The tacit assumption underlying the Lenin-Trotsky theory of dictatorship is this: that the socialist transformation is something for which a readymade formula lies completed in the pocket of the revolutionary party, which needs only to be carried out energetically in practice. This is, unfortunately or – perhaps fortunately – not the case."
January 1, 1970
https://en.wikiquote.org/wiki/Dictatorship_of_the_proletariat