Heart vs. Mind in the Bible
These are two different accounts of the same event. Please notice that Jesus connected reason with heart.
Mark 2:8 And immediately when Jesus perceived in his spirit that they so reasoned within themselves, he said unto them, Why reason ye these things in your hearts?
Luke 5:22 But when Jesus perceived their thoughts, he answering said unto them, What reason ye in your hearts?
I suggest that if there is a difference between 'heart' and 'mind', it is to do with what has been internalised by a person - whether true or not.
For instance, the Pharisees had internalised that only God could forgive sins. But their minds could not take in that a man (Jesus) could be that God - hence, dissonance.
I'm not sure how this observation translates into this discussion, except to say that one's mind is not always receptive to truth, if it contradicts a heart-held stance.
At the same time, truth is always true, whether it is received by mind, or heart, first, and thankfully, God has patience with those of us who are a bit slow on the uptake.
16 That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man; 17 That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, 18 May be able to comprehend with all saints what is the breadth, and length, and depth, and height; 19 And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God.