WHO WOULD SERVE GOD WITHOUT HEAVEN?

Consider this statement from Paris Reidhead: "Lord Jesus, I’m going to obey you and love you and serve you and do what you want me to do as long as I live even if I go to hell at the end of the road because you are worthy to be loved, obeyed and served."

Do we love and serve God because he has promised us eternal life? Who would serve God if they weren’t going to heaven?