What is the origin of the idiom "too much of a good thing" and when to use it?

The idiom "too much of a good thing" has been in use for centuries and is attributed to various sources, including Shakespeare. Its origin lies in the idea that an excess of something that is generally considered positive or beneficial can lead to negative consequences. It is used to caution against excessive or immoderate behavior, consumption, or indulgence in something that is typically seen as positive or enjoyable.