What is the origin of the idiom "change of heart" and when to use it?

The origin of the idiom "change of heart" can be traced back to its literal meaning, which refers to the physical organ associated with emotions and feelings. The heart has long been symbolic of one's emotional state, and the concept of a change occurring within it has been used metaphorically in various languages and cultures. It is commonly used in personal relationships, particularly when someone alters their feelings or disposition towards another person, such as forgiving a previous offense or embracing reconciliation.