Stubborn As A Mule

Idioms are described as ideas as expressions. They develop from older usage, where the words mean something other than their literal meaning. In some cases the meaning of the original expression has been lost, or is an archaism.

This was an illustration to portay an idiom. You know, like quick as cat, quiet as a mouse, slow as a snail, an elephant never forgets, and actions speak louder than words...

Illustration | Vector