Moral of the farmer-donkey story

I think many people have heard the "farmer&donkey" story,it's a classic fable.Here is a flash verson,I like it cause author's comment:

Life is going to shovel dirt on you,all kinds of dirt.The trick to getting out of the well is shake it off and take a step up.Each of our troubles is a stepping stone.
We can get out of the deepest wells by no stopping,never giving up.Shaking it off,and taking a step up!

Remember the 5 simple rules to be happy:
1.Free your heart from hatred.
2.Free your mind from worried.
3.Live simply.
4.Give more.
5.Expect less.