"For the Christian church.... to ignore, euphemize, or otherwise mute the lethal reality of sin is to cut the nerve of the gospel. For the sober truth is that without full disclosure on sin, the gospel of grace becomes impertinent, unnecessary, and finally uninteresting."

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Every Christian church has tried to impose a code of morals of some kind for which it has claimed divine sanction. As these codes have always been opposed to those of the gospels a loophole has been left for moral progress such as hardly exists in other religions.

— John B. S. Haldane