This has been attributed to the late Elmer Keith, but I can't confirm that.

It's funny, somehow I never pictured the old Idaho as a poet!

But if he was, he was pretty good.

If with pleasure you are viewing
any work a man is doing,
If you like it or you love him, tell him now.

Don't withhold your approbations
until the parson makes orations,
As he lies with snowy lilies o'er his brow.

For no matter how you shout it,
he won't really care about it,
He won't know how many teardrops you have shed.
If you think some praise is due him,
now's the time to pass it to him,
For he cannot read his tombstone
when he'd dead.