One of the two things I always clearly remember Glen Davis (pastor of our campus cell group at Stanford) teaching was, that there are different degrees of wrong, and that believing the world is a sphere is less wrong than believing the earth is flat. It's a quote that really makes sense to me, and a principle that has helped me in a lot of my thinking.
Today, I discovered that the quote is from Isaac Asimov's essay on "The Relativity of Wrong". I'm a big fan of Asimov's short fiction, so this just awes me totally.
Even crazier is how I discovered this, going from Gobwin Knob to Xyzzy to Asimov. Strange paths to true things.
(The second thing I remember very clearly is that Christians have five duties... )