Panchatantra Punches Part 4

Let us sharpen our skills smart as sharp as an eagle's eye.
If you just start reading thought provoking stories try to learn the positive message it delivers to your real life. No matter whether it is from a school kid's English text book or from a science fiction fantasy novel or historical fiction article or spy thriller blogs. 

Now let us roll our sleeves and get back to Punches Part 4:

16. You find relief amidst great disaster in telling things to a powerful master, honest servant, a faithful friend or a wife who loves you till the end.

17. Water breaks the dams, love disappears when bad feelings enter, secrets vanish when people start babbling and simple words melt even cruel hearts.

18. Wisely move one foot, while the other holds firmly, for until assured of some new home, do not desert the old.

19. If you are brave and bold, no matter how fierce the enemy, no defeat or sorrow would touch you. Brave hearts do not fear even threats from heavens.

Let me make the next point as a puzzle from the same panchatantra story book. Let me see how many sharp eagles can give an answer to it.

20. "I thought at first it was full of fat,
        I crept within,
        There I did not find a thing,
        Except some wood and skin". What is it?

Answers are expected within 1 week from today. If not , It will be added as comment by myself.