Every Christian should own a copy of John Stott's The Cross of Christ. Just sayin.'

"The Bible takes sin seriously because it takes humanity seriously. As we have seen, Christians do not deny the fact--in  some circumstances--of diminished responsibility, but we affirm that diminished responsibility always entails diminished humanity. To say that somebody 'is not responsible for his actions' is to demean him or her as a human being. It is part of the glory of being human that we are held responsible for our actions. Then, when we also acknowledge our sin and guilt, we receive God's forgiveness, enter into the joy of his salvation, and so become yet more completely human and healthy. What is unhealthy is every wallowing in guilt which does not lead to confession, repentance, faith in Jesus Christ, and so forgiveness."

--John R.W. Stott,  The Cross of Christ