Putting on some new clothing makes you feel good. Driving a new car does likewise. Welcoming the New Year calls for celebration. Then there are making new friends, learning new skills, discovering new solutions to old problems, etc. The feeling of experiencing the new is a good feeling.
I am saving the best feeling of the new for the last. This is the feeling that you are a new creature after you put on Christ. The old "you" no longer lives and it's Christ himself who lives in you. You're now clean, free, and an adopted child of the Father.