Deuteronomy 14:2
2 For thou art an holy people unto the LORD thy God, and the LORD hath chosen thee to be a peculiar people unto himself, above all the nations that are upon the earth.
Matthew 5:16
16 Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Today it is harder to determine who the Christian is and who the sinner is. Why is this? Well it is not because the world has given up sin. It is because Christians are trying to blend in with the world. God called us to be peculiar. That means we should be odd to the world. Our ways should be different to them. What reason do they have to join us if we act and do the same things they do. Think of it this way, if you look and act like the world, how are you shining a light to them? You already know the answer. You are not. Set yourself apart from the world. Be peculiar to them so you can be that light to them.