Of all that I've tried to teach my children, few things matter more to me than gratitude.
"You need to say thank you," I often told them, "and say it like you mean it."
That's also true for "I'm sorry," and "I love you." If you can't say something like you mean it, chances are you don't.
Gratitude changes everything. The one who is thanked feels appreciated. The one who is thankful is healed, transformed from a state of need to a state of grace. And everything around them - the people they love, the air they breathe and the time they share - will be blessed.
This holds true if you're the one feeling less than grateful. You may need to lift yourself up. List five things you're thankful for every day.