appreciation starts from the mind if you have a heart of gratitude your appreciation can never be deceptive, and you won't be able to hide it because anything that comes out of your action the source is in your heart.
your life is a reflection of your heart or your mind what you say and what you do is speaking a lot about your mind
As a man thinketh in his heart so is he, so it become, so he act
evil things come from the heart while good things also come from the heart. What you speak is from your heart and your action is also from your heart.
Train your mind or your heart and you will be good