They wish that they had done more, seen more and felt more. They wish that they had lived with more gusto. Don't let that happen to you. Life is not something to be endured. Life is meant to be lived full out.
Genuine enthusiasm lies just beneath the surface and is always bubbling to the top.
What many people think of as enthusiasm is simply exuberance pasted on the outside. It's always been amazing to me that people will demonstrate more enthusiasm and excitement for their favorite sports team than they do for their own life. Living full out is the only way to really live. Forget about what people might think. You've got to be noisy, or at least your thoughts should be noisy and colorful and lively.