From the "Introduction" of Keith Johnstone's book Impro for Storytellers:

By happenstance I've spent my life teaching the skills that my teachers had ignored. I encourage negative people to be positive, and clever people to be obvious, and anxious people not to do their best. ...

(cf. Impro (2012-11-10), Yes, and... (2012-11-14), ...) - ^z - 2012-12-12