The Problem of Good: When the World Seems Fine without God edited by D Marion Clark and published by P&R Books.
The problem of good for many Christians is two-fold. The first is how to make sense of the "good" found in people who are not Christians. If they can produce good works, both ethically and aesthetically, how necessary is the gospel? And if non-Christians can be relatively moral and loving, how justified is the concept of hell? Such questioning has led many Christians away from their faith.
The second problem for Christians is whether one can benefit from the contributions of the unsaved, and if so, then how? What do we do with the intellectual contributions in all fields? A suspicion of the works of non-Christians has led many Christians to separate themselves from the world and their neighbors and reject even their thoughts that are in keeping with Scripture. An understanding of common grace resolves these conflicts and gives guidance for interacting with the world.