This observation by Robert Frost has long been one of my favorite descriptions of a liberal:
A liberal is a man too broadminded to take his own side in a quarrel.
Of course, that’s only true when the quarrel is with a member of a protected group. A liberal has no such reluctance when quarreling with a conservative.
Looking for a site with the Frost quote led me here, where I found some others worthy of contemplation, such as this from William F. Buckley Jr.:
Liberals claim to want to give a hearing to other views, but then are shocked and offended to discover that there are other views.
I would add that liberals have a tendency to ascribe those views, when found and heard, to prejudice and/or malevolence.
Here’s Niall Ferguson:
So much of liberalism in its classical sense is taken for granted in the west today and even disrespected. We take freedom for granted, and because of this we don’t understand how incredibly vulnerable it is.
We’re learning fast, but not fast enough to stop the process, it seems.