When I was a young father I taught my daughters that every argument has four halves: There is my side. There is your side. There is what I think your side is. There is what you think my side is.

At this point, someone inevitably wants to add: “And there is a fifth side: the truth.”

For a liberal, there is no such fifth side.

This absence is the quintessence of liberalism.

This absence is the space where we can come to new understandings.