Check out this link. It has a more positive version of the poem below.  http://www.emule.com/2poetry/phorum/read.php?7,152028,152411

This is how I feel about the magnet project

They said that it could not be done, he said just let me try.
They said, “Other men have tried and failed,” and he answered, “But not I.”
They said, “It is impossible,” he said, “There is no such word.”
He closed his mind, he closed his heart to everything he heard.

He said, “Within the heart of man, there is a tiny seed.
It grows until it blossoms, it’s called the will to succeed.
Its roots are strength, its stem is hope, its petals inspiration,
Its thorns protect its strong green leaves, its grim determination.

“Its stamens are its skills which help to shape each plan,
For there’s nothing in the universe beyond the scope of man.”
They thought that it could not be done, some even said they knew it,
But he faced up to what could not be done, and he couldn’t bloody do it!

Benny Hill

Here’s the other one, with a more successful outcome:

It Couldn’t Be Done, published 1914, by Edgar A Guest (1881 - 1959)

Somebody said it couldn’t be done,
But he with a chuckle replied
That “maybe it couldn’t,” but he would be one
Who wouldn’t say so till he’d tried.
So he buckled right in with the trace of a grin
On his face. If he worried he hid it.
He started to sing and he tackled the thing
That couldn’t be done, and he did it.

Somebody scoffed: “Oh, you’ll never do that;
At least no one has ever done it”;
But he took off his coat and he took of his hat,
And the first thing we knew he’d begun it.
With a lift of his chin and a bit of a grin,
Without any doubting or quiddit,
He started to sing and he tackled the thing
That couldn’t be done, and he did it.

There are thousands to tell you it cannot be done,
There are thousands to prophesy failure;
There are thousands to point out to you, one by one,
The dangers that wait to assail you.
But just buckle in with a bit of a grin,
Just take off your coat and go to it;
Just start to sing as you tackle the thing
That “cannot be done,” and you’ll do it.