I like quotes that make me think and this is one of them. It’s like a which came first the chicken or the egg riddle.
Happy people had to get happy someway didn’t they? Probably something good came into their lives that made them thankful. Is it possible to be happy without being thankful? Meditate on that for a while and you will probably come to some realizations that will help you on your journey.
What emotion do people who are thankful have? Happiness, peace, content, etc. Is it possible for someone to be thankful and not be happy? I don’t think so.