Saying thank you is a habit. It shows that you appreciate everything. Big things and little things. And appreciation is an important aspect of a happy life.
How Two Words Can Change Your Life
Darius Foroux

And it goes to the heart. A simple “Thank you” makes people around you feel that they have a purpose to be in your life. That it is meant to be. Show appreciation! Show gratiture! and people will start seeing you as a model of modesty and humility.

Thank you for a such a great article!