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If one's conscience is willing to confess whatever sins have been committed, including the sin of unbelief, it will be sorrowful in a godly way, earnestly desiring the mercy of God.

Watchman Nee (2006). “Journeying Towards the Spiritual: A Digest of the Spiritual Man in 42 Lessons”, p.109, Christian Fellowship Publishers
If one's conscience is willing to confess whatever sins have been committed, including the sin of unbelief, it will be sorrowful in a godly way, earnestly desiring the mercy of God.