If the only prayer you said in your whole life was,
Thank You, that would suffice.
- Meister Eckhart

However much or little you have,
"Thank You" is always a more powerful prayer than, "I need more."
- Jonathan Lockwood Huie

Whoever does not regard what he has
as most ample wealth, is unhappy,
though he be master of the world.
- Epictetus

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

Further reading: The Power of Gratitude

Gratitude for Small Miracles

Zero-Based Gratitude

Unanswered Prayer