I have been listening to an audiobook, "Positive Words; Powerful Results" so I can get the analytical version of why the positive outlook is so beautiful.
One of the best parts so far (and there have been many "best parts") goes something like this, "When you hear a word, you consume it as you would a piece of food. It becomes part of who you are. You are what you eat; you are what you hear; you are what you say."
We just came up with a way to communicate the bulk of the audiobook to the kids:
"You are what you eat, from your head to your feet.
You are what you say, in each and every way."
Dorky, I know, but it works.