Keep a Goin by Frank Lebby Stanton.

If you strike a thorn or rose,
Keep a-goin’!
If it hails or if it snows,
Keep a-goin’!
‘Taint no use to sit an’ whine
When the fish ain’t on your line;
Bait your hook an’ keep a-tryin’–
Keep a-goin’!

When the weather kills your crop,
Keep a-goin’!
Though ’tis work to reach the top,
Keep a-goin’!

S’pose you’re out o’ ev’ry dime,
Gittin’ broke ain’t any crime;
Tell the world you’re feelin’ prime–
Keep a-goin’!

When it looks like all is up,
Keep a-goin’!
Drain the sweetness from the cup,
Keep a-goin’!
See the wild birds on the wing, 
Hear the bells that sweetly ring,
When you feel like singin’, sing–
Keep a-goin’!