If you are doing good for selfish reasons, you are not doing good; you are just good at being selfish.
Why Church Isn't Comfortable (And Shouldn't Be)
Why is church uncomfortable? This article explains that in church we are called to die to selfishness and live to serve others.
What’s in It for Me? The Selfist Philosophy
The Tithe: A Picture of God's Tender Love
Philippians 2:3-4 - Humility and the Communion of Saints
This article on Philippians 2:3-4 is about the importance of humility (versus selfishness) for church unity and good fellowship.