Thinking about this quote in the context of a wayward mind ....
"Sin in it's ordinary progression first deceives, next hardens, and then destroys." - John Thornton
We talk about wayward "fog", which is verbal expression of the self deception that goes on in a wayward mind. Deception which allows a so called "normal" person to commit adultery. "The enemy" is the ultimate liar. What deception does is this, deception makes swallowing a deadly poison seem like a desirable choice. This is the point in adultery where the waywards telling themselves lies might be shocked into reality by exposure. perhaps not, but it is possible. Truth & light are kryptonite to the deception. I am talking about the wayward losing his/her mind.
Now, about the wayward's heart. It hardens. The wayward heart becomes callous. The wayward heart becomes closed off and insensitive to the pain and devastation their adultery causes. The wayward can even accept the broken hearts of their own children if that pain supports their adultery. The wayward becomes impervious to empathy. Cry all you want, your tears have no meaning for the hardened heart of a lost wayward. Your tears, your pain only annoy the hardened wayward heart.
And finally, the wayward's soul. The sin of adultery destroys the wayward's soul. The spiritual essence of humanity is nowhere to be found in the wayward. Integrity has been cast off in order for the adultery to continue. The wayward does not go on his/her merry way unscathed. The wayward is the most wounded of all. The destruction of a once beautiful soul, now made ugly by sin, is heartbreaking.
There is a progression to this loss.
Humans are vulnerable to temptation.
Temptation feels good.
But, giving into the sin, and living in the sin is life changing.
We can actually SEE it sometimes.
We can actually SEE the cold eyes of the hardened heart.
We can actually SEE the lifeless eyes of the soulless.