It Couldn’t Be Done
By Edgar A. Guest

Somebody said that 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 as 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 ever has done it”;
But he took off his coat and he took off 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 as 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.

A Psalm of Life by Henry Wadsworth Longfellow

TELL me not, in mournful numbers,
Life is but an empty dream!—
For the soul is dead that slumbers,
And things are not what they seem.

Life is real! Life is earnest! 5
And the grave is not its goal;
Dust thou art, to dust returnest,
Was not spoken of the soul.

Not enjoyment, and not sorrow,
Is our destined end or way; 10
But to act, that each to-morrow
Find us farther than to-day.

Art is long, and Time is fleeting,
And our hearts, though stout and brave,
Still, like muffled drums, are beating 15
Funeral marches to the grave.

In the world’s broad field of battle,
In the bivouac of Life,
Be not like dumb, driven cattle!
Be a hero in the strife! 20

Trust no Future, howe’er pleasant!
Let the dead Past bury its dead!
Act,—act in the living Present!
Heart within, and God o’erhead!

Lives of great men all remind us 25
We can make our lives sublime,
And, departing, leave behind us
Footprints on the sands of time;

Footprints, that perhaps another,
Sailing o’er life’s solemn main, 30
A forlorn and shipwrecked brother,
Seeing, shall take heart again.

Let us, then, be up and doing,
With a heart for any fate;
Still achieving, still pursuing, 35
Learn to labor and to wait

When things go wrong, as they sometimes will,
When the road you’re trudging seems all uphill,
When the funds are low and the debts are high,
And you want to smile, but you have to sigh,
When care is pressing you down a bit,
Rest, if you must, but don’t you quit.

Life is queer with its twists and turns,
As every one of us sometimes learns,
And many a failure turns about,
When he might have won had he stuck it out;
Don’t give up though the pace seems slow–
You may succeed with another blow.

Often the goal is nearer than,
It seems to a faint and faltering man,
Often the struggler has given up,
When he might have captured the victor’s cup,
And he learned too late when the night slipped down,
How close he was to the golden crown.

Success is failure turned inside out–
The silver tint of the clouds of doubt,
And you never can tell how close you are,
It may be near when it seems so far,
So stick to the fight when you’re hardest hit–
It’s when things seem worst that you must not quit.

- Author unknown

Here’s one that keeps me going – http://blog.ynzi.com/lake-i-sought
Disclaimer: I wrote it, so.