Conservatives take a dim view of progress. They are not so foolish as to deny that great advances have been made in science, technology, medicine, communication, management, education, and so forth, and that they have changed human lives for the better. But they have also changed them for the worse. Advances have been both beneficial and harmful. They have certainly enlarged the stock of human possibilities, but the possibilities are for both good and evil, and new possibilities are seldom without new evils. Conservatives tend to be pessimistic because they doubt that more possibilities will make lives on the whole better. They believe that there are obstacles that stand in the way of the permanent overall improvement of the human condition.