Kitto's Popular Cyclopedia of Biblial Literature
All the phrases, more or less metaphorical, in which this word occurs, are rendered intelligible, without detailed examples, when we are told that the heart was, among the Hebrews, regarded poetically not only as the seat of the passions and emotions, as of love, pleasure, and grief, but also of the intellectual faculties—the mind, the understanding. In the original Scriptures, as well as in the English and other translations, the word 'heart' therefore, constantly occurs where 'mind' is to be understood, and would be used by a modern English writer. We say modern, because the ancient usage of the English word 'heart' was more conformable than the present to that of the Hebrews.
Kitto, John, ed. Entry for 'Heart'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/h/heart.html.