Loving a Stranger

How does one show the love of God to a complete stranger? To someone who doesn't have time to talk to you? For example, a cashier at Walmart. Is a friendly smile and a few kind words enough? Can something as simple as that communicate the love of God, without making it obvious that I am a follower of Christ? I need to be more intentional about spreading God's love, because it is my purpose on this earth! The world doesn't need a "religion" fed to them. They need to see Christians loving them, loving each other, and loving others.