Conversation

"
When we speak of rational as opposed to Utopian policies, we tend to say of the latter that they ignore, or are defeated by, the 'inexorable logic of the (historical) facts' or the 'wheels of history', which it is idle to try to stay.
"
Isaiah Berlin - The Concept of Scientific History

http://berlin.wolf.ox.ac.uk/published_works/cc/scihist.pdf