"Hello. How are you?"
This question is often asked in the familiar greeting pattern. "I'm fine, thank you! And you?" You reply: "Great!" or "Good!" even on days when you don't feel great, good, or nice. It's more of a reflexive reaction; you don't share your true feelings.
Seriously now, though. How are you? Like puzzles, your life consists of many thousands of days. Imagine each day as a puzzle piece colored by your mood. Days of joy that lift your spirits in bright orange and vibrant yellow. Days of sadness in soft blue.
Days when you are tired, down, and empty in dull gray. Now take a step back from your theoretical puzzle and take a look. What color appears on most pieces?