What Does It Mean To Be Thankful?

During this time of year, it is common to take stock of your life and think about things for which you are grateful.

But what exactly does this entail? Is being thankful a state of mind, or does there need to be a public display? Are there any actions or behaviors that are associated with thankfulness? If not, what is the difference between being thankful and doing nothing?

What does it mean to be thankful?

Related questions: How does appreciation enrich the individual? How can we turn ideas into actions? How are gratitude and happiness related? What do we have in common?