Cumulative Record. Chapter 49: Pigeons in a Pelican. Quote 9

In the year which followed the termination of Project Pigeon I wrote Walden Two, a utopian picture of a properly engineered society. Some psychotherapists might argue that I was suffering from personal rejection and simply retreated to a fantasied world where everything went according to plan, where there never was heard a discouraging word. But another explanation is, I think, equally plausible. That piece of science fiction was a declaration of confidence in a technology of behavior. Call it a crackpot idea if you will; it is one in which I have never lost faith. (p. 647)