The original author of the Don't Quit poem is unknown. But the U.S. Copyright Office recognizes this poem as Public Domain.There are many frauds out there in the internet claiming to be the authors of the Don't Quit Poem.

Don't Quit

Author Unknown

When things go wrong, as they sometimes will,
When the road your 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 its turns,
As everyone of us sometimes learns,
And many a failure turns about
When they might have won, had they stuck it out.
Don't give up though the pace seems slow,
You may succeed with another blow.

Often the struggler has given up
When he might have captured the victors cup;
And he learned too late when the night came 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 your hardest hit,
It's when things seem worst that you must not quit!