John 9:5 (NKJV)
"You are the light of the world. A city that is set on a hill cannot be hidden."
Matthew 5:14 (NKJV)
So am I suggesting that Christians should live a life of following some rules and regulations in order to prove that they are Christians? Actually no, because as Paul wrote in Galatians 2:16 no one is put in a right position with God based on their works. What I am saying is similar to what we read in James 2:20 where it says that faith without works is dead. We don't do good works to get saved but because we are saved our life should produce good works.
Romans 12:1, 2 talks about Christians not being like the world but instead presenting our bodies to God to do His will and renewing our minds with the Word of God. By doing this we are transformed to be like Jesus instead of being conformed to the world; people who are not Christians need to see a difference in our lives because we are a new creation in Christ (2 Corinthians 5:17). Make the decision today that you will carry on the work of Jesus and be a light to the dark world around you. You may be in this world but you are different than the world, let your light shine!