
a) don't go swimming in the sea,
b) stay away from brown jars
One day while she was occupied with making herself shiny and more beautiful, the white jar saw something she had not seen before in her life. It was a brown jar solidly made and strong. Suddenly, she felt something inside of her that she never felt before.

Everyday, the brown jar would come to visit and tell the white jar of the world she had never seen, of places she could only dream of.
Then, one day the brown jar invited her to go swimming in the sea. Forgetting her mother's advise she went with the brown jar.
It was fun swimming! She never had that much fun in her life before. Then, the wind began to pick up and the waves started to swell. As much as she tried to keep her balance she could not. A particularly strong wave washed over both of the jars and the white jar was pushed violently against her brown companion. As she shattered into a hundred fragments a thought entered the white jar's mind in a flash.
"Stay away from brown jars."
Moral: When the wise one tells you something, there's always a reason for it.