Hayek's essential political philosophy was that liberty is the supremacy of law. To some, this may appear a paradoxical conception of liberty, for liberty is too often considered to be the absence of law. This, however, was the exact opposite of Hayek's view. He thought that liberty is not possible without law. Right law is liberty.

Hayek's Journey: The Mind of Friedrich Hayek (2003) - Ch. 9 : The Road to Serfdom