In His saying, the Exalted: “Then their skins and hearts soften at the remembrance of Allah,” what is the benefit of mentioning the skins?

The student: ...

The Shaykh : Yes, there is no harm. I say, “May Allah rectify my heart and my deeds.” I say there is no harm in saying, “May Allah rectify my heart and my deeds.”
The student: ...

The Shaykh : ... And because Allah described the skins themselves, He said: The shivering of the skins is based on the fear of the heart. So Allah mentioned that this shivering goes away and turns into softness, and so does the heart, which is its origin.