A fun quote from Joseph A. Schumpeter's Capitalism, Socialism, and Democracy (I'm reading from the 3rd edition from 1950):

The conclusions alluded to at the end of the preceding chapter [unsympathetic to capitalism] are in fact almost completely false. Yet they follow from observations and theorems that are almost completely true. Both economists and popular writers have once more run away with some fragments of reality they happened to grasp. These fragments themselves were mostly seen correctly. Their formal properties were mostly developed correctly. But no conclusions about capitalist reality as a whole follow from such fragmentary analyses. If we draw them nevertheless, we can be right only by accident. That has been done. And the lucky accident did not happen.

This is from p. 82 (footnote omitted).