Those who allow their sins to fully take over them risk becoming inseparable from those very sins, it quite literally becomes a core trait of their soul, something that begins to take over and plants its roots deep within. A man who lets pride rule him becomes the essence of pride, never being able to admit fault or take criticism lightly. Those who surrender to lust willingly give their mind and body to quick, temporary pleasure and an unending craving for greater pleasure than previously had, often sacrificing anything to achieve this.

Those are just some small examples, you can probably piece together similar examples for the other five. In short, surrendering and fully giving into these deadly sins comes with giving your mind, body, and soul to them, making you a soulless husk that only serves to appease the sin that has taken root.