"Unbelief squashes; faith teaches. Faith takes a boy aside, and tells him that this part of what he did was good, while that other part of what he did got in the way. 'And this is how to do it better next time.' ...Unbelief cannot look past the surface. If there was any sin involved, unbelief sees only the sin. Faith sees what was turned aside to the service of sin and seeks to turn it back again. Sin is parasitic and cannot function without some good attributes that it seeks to corrupt. Consequently, faith must distinguish that which must be preserved and developed and that which must be abandoned as sin."
From Future Men, by Douglas Wilson