It's comforting to know that other musicians subscribe to the same principle and are able to explain it so thoroughly. And musician or not, this principle can be applied to any endeavor. It conveys the idea that an unexpected change of course is an opportunity to create something that will be possibly even more enriching than what you had originally planned.
This happens to me and my composing partner, Paul, quite often as we start to record a new composition. When we are set, we hit record and even if there is a "mistake" (something we hadn't planned on), it is a journey into the realm of the Absolute from which all creativity flows and most often a very "happy accident". Many new songs have arisen from the flow of such "accidental" streams.
Below is the link to the TED Talks video by Stefon Harris. May you see every "mistake" as an opportunity to create something new and exciting! :O)
TED Talks -Stefon Harris There are no mistakes on the bandstand.html