No Stings Attached?

What is the value in being a blessing to someone if they don’t know you are a Christian? This was a discussion a little while ago and one worth having. If, because I have Christ in my life, I am a bit kinder, more patient, and less rude with people in general (okay, I know just because I’m a Christian does not mean I am not a jerk, but when I’m living the way God wants me to…), is it beneficial to the Kingdom of God for one to show love and grace to another when the other person has no idea why you would do this or who gives you the ability to be so different?