Is it the belief of the people of the Sunnah that the location of the intellect is in the heart or in the head?

The questioner : The question is: Is it the belief of the people of the Sunnah that the location of the intellect is in the heart? Because Allah the Exalted said: Or does the meaning of the verse "they understand" mean that they take heed and reflect? Please inform us of the belief of the people of the Sunnah so that we may hold it? May Allah reward you with good.

The Shaykh : Fine, what is the benefit of this? I mean, does the Qur'an indicate that the intellect is in the heart or in the head? The correct view is that the intellect is in the heart, necessarily, but it has a connection to the brain, as Imam Ahmad (may Allah have mercy on him) said: "Its location is the heart, and it has a connection to the brain," because it is known now that if the brain is corrupted, the intellect is corrupted. Do you understand? Even if it were said—and I do not know if anyone has said this—that the intellect of sound judgment is in the heart, while the intellect of perception is in the brain, if this were said, it would not be far-fetched, because there is a difference between the intellect of sound judgment, which is good conduct, and the intellect of perception, which is mere sensory perception.