Will Rogers is one of my favorite writers of "one liners".
Here are a few of his tidbits of wisdom:
The Wisdom of Will Rogers
* Good judgment comes from experience, and a lot of that comes
from bad judgment.
* Lettin' the cat outta the bag is a whole lot easier 'n puttin'
it back in.
* If you're ridin' ahead of the herd, take a look back every now
and then to make sure it's still there.
* If you get to thinkin' you're a person of some influence, try
orderin' somebody else's dog around.
* If you find yourself in a hole, the first thing to do is stop
diggin'.
* When you give a lesson in meanness to a critter or a person,
don't be surprised if they learn their lesson.
* Never miss a good chance to shut up.