In all things, give thanks.
Thessalonians 5:18
Thanks come in many shapes and sizes, but the most simple and most powerful is in a word. A simple 'thank you' for passing a pen, picking up a coat, saying something nice or giving recognition for an action has a huge positive effect.
When was the last time you said thanks to a friend? A colleague? A loved one? A teacher? A parent? I bet that the response was a smile!