“Mistakes
are the inevitable consequence of doing something new; without them, we would have no originality.”
Ceramic Art by Yee Sookyung 
“Embracing failure is an important part of learning, an opportunity for growth. Sometimes you have to use the mistake to rethink the problem. Thinking flexibly requires one to reassess the problem as it changes.”
The above quotes are from Edwin Catmull and Amy Wallace. They are an excerpt from the book A Mindset for Learning, written by Kristi Mraz and Christine Hertz, which is an excellent resource for teachers.