“Gratitude is essential to happiness. Developing a grateful attitude--knowing that every time we arrive somewhere safely, we have something to be happy about; every time our children rush up to us and smile, we have something to be happy about; every time we get out of bed and can take a deep breath and go out for a walk, we have something to be happy about--that is the essence of a happy existence. Happiness is a muscle we must use, or it will wither away.”
