Definition & Meaning of "enough is enough"

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

The idiom "enough is enough" is an English expression that is thought to have derived from the Latin phrase "sat est", which means "it is enough". This phrase was used by the Roman philosopher Seneca in his letters to his friend and student Lucilius, in which he advised Lucilius to be content with what he had and not to seek too much wealth or power. This expression has been used by people to express their frustration with injustice, oppression, or tyranny. It has also been used to express the need for moderation and self-control.