Every step and every movement of the multitude, even in what are termed enlightened ages, are made with equal blindness to the future; and nations stumble upon establishments, which are indeed the result of human action, but not the execution of any human design. If Cromwell said, that a man never mounts higher, than when he knows not whither he is going; it may with more reason be affirmed of communities, that they admit of the greatest revolutions where no change is intended, and that the most refined politicians do not always know whither they are leading the state by their projects.
Adam Ferguson, An Essay on the History of Civil Society (1767). The first sentence has been cited often, becoming a byword for Austrian economist and social philosopher F. A. Hayek.