The effect of unaddressed sin is like the effect of a gradual build-up of pressure being applied to a glass jar. Up to a certain point the jar will tolerate the pressure, and the effect of the force upon the jar will not be discernible to the eye. But once the limit of the jar’s strength / ability to resist the applied force has been reached, it will shatter. If man is the jar, sin is the force applying the pressure. We don’t always immediately perceive the effect our sins have upon us, but if they accumulate and remain unforgiven because we fail to repent of them, eventually we, like the jar, become broken.