You are the light of the world. A city set on a hill cannot be hidden. Nor do people light a lamp and put it under a basket, but on a stand, and it gives light to all in the house. In the same way, let your light shine before others, so that they may see your good works and give glory to your Father who is in heaven. – Matt 5:14-16 (ESV)
As Christians, we should be doing good. Sure, we should do good out of our love for the Lord and because doing good is the right thing to do, but another reason is so that others would glorify God. This is a reason that hardly ever pops in my mind when faced with a ‘good doing’ situation. We should not be shy about doing things because others might see them – this is one of the purposes for doing good. Don’t lie about the good things you have done in order to have some skewed sense of piety.