Forgiveness and a metaphor from Italian medical history
Pacinian Corpuscle is a major tactile sensory mechanism in mammalian skin, discovered by Italian anatomist Filippo Pacini. It detects pressure changes and vibrations in the skin. When the external pressure such as touch is applied to the skin, it senses the vibration by deforming layers of lines until the nerve ending in the center processes the touch. The Pacinian corpuscle can be described as oval-cylindrical-shaped, 1 mm in length and consists of 20 to 60 concentric lamellae (like onion rings) connected by nerve endings at the center.

This microscopic image depicts the inner struggles we as humans experience via external stimuli, especially when it is negative. Natural reaction when the core of the structure is sensed as unfavorable is to recoil, retreat, shrink, flee, and finally fight if necessary.
Act of forgiveness, whether it is given or received, requires unnatural process of action. The power of the unnatural process of forgiveness is perhaps not possible by natural selection of human ability. God needs to intervene, so that humans can live peacefully with others and our own selves.
Photo of Florence by #Josh Hild