what is the meaning of beware the fury of a patient man?

The phrase "beware the fury of a patient man" suggests that individuals who are normally calm and composed can harbor intense emotions beneath their tranquil exterior. When such a person finally reaches their breaking point, their anger can be unexpectedly powerful and destructive. It serves as a warning to not underestimate those who are patient, as their wrath can be fierce when provoked. This saying highlights the potential consequences of pushing someone too far, emphasizing the importance of respect and understanding.