"What is to be learned from the testimonies of pornography’s users is the important fact that, contrary to prevailing cultural assumptions, the lust of the eyes is not a “hot” but rather a “cold” vice. It arises from the roaming unrest of the spirit rooted in a spiritual apathy that, again, despairs of and eventually comes to resent the very transcendence in which the dignity of the human person has its roots. The lust of the eyes that feeds on Internet pornography does not inflame but rather freezes the soul and the heart in a cold indifference to the human dignity of others and of oneself." (emphasis mine)
On reading that, I was reminded of something Lucifer says in Supernatural:
"Sorry if it's a bit chilly. Most people think I burn hot. It's actually quite the opposite." (s5, e22)
In general, our imagery of the devil is often fiery--red suit and horns, fiery pitchfork, etc. Yet it is our God that appears as a burning bush and pillar of fire. It is Jesus who is the light of the world. It is the Holy Spirit that descends as tongues of flame. "Our God is a consuming fire", St. Paul writes. (Heb 12:29)
The closer you get to God, the closer you get to that fire and that light. When you turn away, you turn away from the fire. When you walk away, you walk into the darkness and into the cold.
Sin doesn't heat you up, it cools you down. It "freezes the soul and the heart", as Dr. Hütter put it. Of course Lucifer, the 'light bearer' would run cold. He's long since put down that light and walked away from the fire of God.