Does the Shari'ah address the intellect or the heart?

The questioner:
What is the relationship between the heart in the chest and the brain in the head? And if the heart is replaced with an artificial heart, does its owner reason as he did before? And which of the two is addressed by the Shari'ah?

The Shaykh:
Allah (Exalted and Majestic is He) gave man a heart and an intellect. Allah (Mighty and Majestic) So Allah placed in the hearts what enables a person to understand things, and He established a connection between these hearts and the brain, of which Allah knows the nature. There is a connection between the brain and the heart; the intellect resides in the heart, and it has a connection with the brain. If an artificial heart is implanted and becomes established, it possesses the same characteristics, because the substance that nourishes the first is the same substance that nourishes the second. Yes. Yes.
The substance is one and present, so that heart transitions from its bad state to a good state, or vice versa, according to what happens to it. So if it transitions from a disbeliever's heart to a Muslim's, and the good substances come to it, it becomes sound. And if a Muslim's heart transitions to a disbeliever's heart and the corrupt substances come to it, they corrupt it.

The questioner:
What is this time?

The Shaykh:
So it is according to the sensory and divine substances with which it is nourished by the permission of Allah. Yes.