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The key to the experiment is the separation of the Control Group from the Test Group, unless this can be done with quantifiable precision, the experiment will not be conclusive. But the line, conveniently, is not a physical one but a conceptual one and placed precisely where the line can be the most convenient and precisely located. The line is an accounting device, as precise as the line between profit and loss and between your accounts and mine. The most clear and distinct thing possible to conceive is the line between believer and the unrepentant sinner.