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

The idiom "get to the heart of something" originated from the idea of metaphorically digging or probing to reach the central or foundational aspects of a matter. The "heart" refers to the core or essence, while the "bottom" represents the underlying or fundamental truth. This idiom likely emerged from the notion of physically excavating or investigating to expose hidden or essential elements. It is commonly employed in problem-solving discussions, investigative settings, or analytical conversations where a thorough understanding is sought.