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Diamonds and coal or graphite are variations of the same material. The variations in any external circumstances will then influence the final condition of the rock. The same could be said for people. We start out with a clean slate. Physical, spiritual, and our own psychological pressures create variations.
When we look at the diversity of the result of life's influences, we realize that, without God, the direction we take becomes a fixed path. Only the direction changes, but it all leads away from God.