Slightly complicated in places as it seems to switch between 'heart' meaning physical organ and 'heart' in the more metaphorical sense - although one of the things it is also exploring is what the connection between those two definitions of 'heart' is.
Things it made me think of:
“In our world,” said Eustace, “a star is a huge ball of flaming gas.”
“Even in your world, my son, that is not what a star is but only what it is made of."
From the Voyage of the Dawn Treader by C.S. Lewis
Sonny from iRobot (the film, not the book). Specifically the scene where they open him up to see what makes him tick.
Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.
Gnosticism is wrong.