How does the next paragraph end?

How to be happier by showing gratitude
Remember to say thank you to everyone who performs a small courtesy like opening a door.
The more opportunities you find to say thank you, the better you will feel about your life at the end of the day.
Smile at every cashier, bank teller and bus boy and say " thank you.
" the effects of gratitude are contagious. When you show it to others, they will immediately mirror it back to you.