If you're not making mistakes, you're not taking risks, and that means you're not going anywhere. The key is to make mistakes faster than the competition, so you have more chances to learn and win.
-- John. W. Holt
Agree with the first part but not (the wording of) the second part. If you know beforehand that something would be a mistake, don't be stupid.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.