My Grandpa taught me:
Don't worry about the future.
But know that worrying is as effective
As trying to solve an algebra equation
By eating 12 dill pickles on Sunday.
The real troubles in your life will be
The things you never think about
They are the kind that blindside you
At 4 pm on Tuesday during a rain storm
John McCornack
http://www.poemhunter.com/poem/algebra-equation/