Change should generally evolve slowly. It is wrong to remain routed in old beliefs long after the evidence proves the old beliefs wrong. The more common arrogance is to push for the change we believe is right, before the change has been sampled, tested and tasted by many.
"tradition is usually the best guide. Clever innovations can improve on tradition, but they do so with much less frequency than intellectuals implicitly believe."
- Political Dispositions, Arnold Kling | EconLog | Library of Economics and Liberty (view on Google Sidewiki)