Serving others is in our DNA. When God created us, he hard wired us to want to serve others. It's who we are. It's what gives us a sense of accomplishment, meaning, and belonging in the world.
When we serve, it's a sacrifice of our time and resources. We call this surrendered living. God uses this surrendered living to bring about two things: 1) It draws new people to him and his church; and 2) He changes US through the sacrifice we make.