Question and Quote

Hey so I'm not going to blog for a few days so here is the quotes in days advance.

"Failure is simply the opportunity to begin again, this time more intelligently."

~Henry Ford~

Question 

How can failure help you become more intelligent?

Question
What failures are worth learning for?

Question
Is all failures worth learning for? Why or Why Not?

Question
When is it not okay to fail even if you learn?