Determined to Do the Right Thing

I think it was while reading Mary Midgley's Wickedness (no, it's not a how-to book), years ago, that I got into an argument about free will with a student who saw me reading it. He rejected the idea, I forget whether it was on behaviorist or biological-determinist grounds, and it suddenly popped into my head to tell him: Well, I'd like to believe that I don't have free will, but I can't help it