"a cat and a mouse"

The old story of a' cat and a mouse' has taught all of us a lot.
The old story of a 'cat and a lion' has taught all of us a lot.

I always thought of a cat as a teacher.
I always thought I did not learn anything from the mouse.

Until I knew that in today's world I am learning everything from the mouse.
Now I know my real teacher is a mouse !