Quote from Joseph Sobran,
"Liberals have a new wish every time their latest wish is granted. Conservatives should make them spell out their principles and ideals. Instead of doing this, conservatives allow liberals to pursue incremental goals without revealing their ultimate destination. So, thanks to the negligence of their opponents, liberals control the terms of every debate by always demanding 'more' while never defining 'enough.' The predictable result is that they always get more, and it's never enough."