How often are your kids in a calm, peaceful state? Kids do their best when they are feeling safe and calm. Being in a calm emotional state is essential for optimal learning.
Football quarterbacks also perform their best when they are calm and focused. They can take in the big picture, avoid getting sacked and complete amazing passes. You can see it in their eyes when they are calm versus frazzled. Once they are frazzled, they make lots of mistakes. Just like quarterbacks, your kids are at their best when they are calm.
(finish reading the article on PricelessParenting.com)