'...we will...meet a lot of people who hold to other religions or to no religion who are wiser, kinder and more thoughtful than we are, because even after growth in grace, many Christians are weaker people than many non-Christians. When this surprises you, reflect on it. If the gospel of grace is true, why would we think that Christians are a better kind of person than non-Christians? These living examples of common grace may begin to show us that even though we intellectually understand the doctrine of justification by faith alone, functionally we continue to assume that salvation is by moral goodness and works.'
Timothy Keller, Center Church, p.168.