Don't squat with your spurs on.

Better than a poke in the eye with a sharp stick.

You're not holding your mouth right. (When something didn't work when tried)

You'll never see it on a trottin' horse.
(I've also heard it with a galloping horse but my grandmother's horse was trottin')

Do unto others as you would have them do unto you.
What goes around comes around.

Don't judge a book by it's cover.
Beauty is only skin deep but ugly goes to the bone.
Don't look a gift horse in the mouth.
Don't bite the hand that feeds you.
Be careful what you say, you may have to eat those words.
Give people the benefit of the doubt until they prove you wrong.
Don't back down when you know you're right.
Smile, people will wonder what you've been up to.
and from my grandma, "Be kind to others, it shows good breeding."

A job started is half done.

If the rabbit wouldn't have stopped to look at the flowers along the road, the fox would still be hungry...

God don't like ugly

Good always comes from bad. (I truly believe it.)
Don't wish your life away.

The apple didn't fall far from the tree.

Shoot fire and save matches. (The expurgated version. The original was "S--t fire")

Ya can't beat out of 'em what's born in 'em.

Sew on Sunday, weep on Monday.

God couldn't be everywhere so He made mothers.

Daisies don't tell.

Bread is the staff of life.

No sense, no feeling. or No brain, no pain.