God gave you a gift of 86,400 seconds today.  Have you used one to say “thank you?”
- William A. Ward

Silent gratitude isn’t much use to anyone.
- G.B. Stern

Who does not thank for little will not thank for much.
- Estonian Proverb

The hardest arithmetic to master is that which enables us to count our blessings.
- Eric Hoffer

Be thankful for what you have; you’ll end up having more. If you concentrate on what you don’t have, you will never, ever have enough.
- Oprah Winfrey

I’m thankful to be breathing, on this side of the grass. Whatever comes, comes.
- Ron Perlman

And it seems there’s always a spoilsport:

Gratitude is a sickness suffered by dogs.
- Joseph Stalin

Gratitude – the meanest and most sniveling attribute in the world.
- Dorothy Parker