I heard from someone that the soul resides in one's mind/ brain.
Does anyone where the source for this can be found?
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Nefesh HaChaim 1:14:
מחשבה היא בחינת הנשמה שהיא המלמדת לאדם דיעה ובינה בתוה"ק. לכן עיקר משכנה הוא במוח כלי המחשבה
Thought is the faculty of the soul (Neshama) which teaches the person knowledge and understanding in Torah. Therefore its primary residence is in the mind, the tool of thought.