"Life is a promise; fulfill it." - Mother Theresa

"They can because they think they can" - Virgil

"Happiness depends more on the inward disposition of mind than
on outward circumstances." - Benjamin Franklin

"All that we are is the result of what we have thought. 
The mind is everything. What we think we become." ~ The Buddha

From the Buddha's Dhammapada(freely translated by Stephen Mitchell)

Mind creates the world;
what you see arises with your thoughts.
If you speak and act with a confused mind,
trouble will follow you as certainly
as a cart follows the ox that pulls it.

Mind creates the world;
what you see arises with your thoughts.
If you speak and act with a clear mind,
happiness will follow you as certainly
as your own shadow in sunlight.

"It’s his fault." "She shouldn’t have done that."
Believe such thoughts, and you live in resentment.

"It’s his fault." "She shouldn’t have done that."
Question such thoughts, and you live in freedom.

Anger teaches anger.
Fear results in more fear.
Only understanding can lead to peace.
This is the ancient law.

The amazing thing about impermanence is that the realization of it opens up in you the dimension of space or stillness, when it is not resisted. This is why many spiritual teachings point to the fact of impermanence of all form as a teaching device, because the moment you see how fleeting everything is—and don't resist it—something in you feels spacious and peaceful- Eckhart Tolle