What is the origin of the idiom "fall from grace" and when to use it?

The origin of the idiom "fall from grace" is rooted in Christian theology, where "grace" refers to the unmerited favor or gift of God. In this context, a fall from grace would refer to the loss of God's favor and the subsequent punishment for wrongdoing. Over time, the phrase has evolved to refer to any situation where someone experiences a significant and sudden decline in status or reputation due to their own actions or behavior, whether it's in a religious, political, or social context. Today, the idiom is commonly used to describe the downfall of public figures who have fallen out of favor with the public due to scandal or misconduct.