As Christ followers we can change the world.
Have you ever watched liquid when an object is dropped into it? It causes ripples right? They start out small and depending on the size of the liquid container they grow and become increasingly bigger.
As Christians this is how we should effect the world. Each of us are a pebble thrown into a massive lake. Wherever we go, whoever we are in contact with, we reflect Jesus. When we do that we have just plopped into the water. You effect that person, they go and effect someone else, and that someone effects someone else and so on. Can you imagine someone across the world benefited because of you choosing to reflect Jesus?