Hayek is saying that his big book restating some “old truths” was necessary in 1959 because making the case for liberalism is a Sisyphean task. If the old truths are not updated for each new age, they will slip from our grasp and lose our allegiance. The terms in which those truths have been couched will become hollow, potted mottoes, will fail to galvanize, inspire, and move us. The old truths will remain truths, but they’ll be dismissed and neglected as mere dogma, noise. And the liberal, open society will again face a crisis of faith.
This won’t be an exercise in narrowly sectarian ideology or political dogma. It can’t be. The fact that liberalism has become rote is central to our problem. Academic left-liberalism is doggedly utopian—and stale. Democratic Party liberalism is incoherent—and stale. Orthodox libertarianism is dogmatically blinkered—and stale. The “classical liberalism” of conservative-libertarian fusionism is phony—and stale. Each of our legacy liberalisms is, in its own way, corrupt. It’s all part of our pitted, pocked, cracked and creaking liberal cultural infrastructure. It doesn’t help to replace rotten wood with rotten wood, rusty pipe with rusty pipe. Hayek himself told us we can’t fix it with Hayek.
If this is too much of a quote, I’ll reduce it down, but what an important message.