I realized up there that our planet is not infinite. It's fragile.

Alan Shepard

The only person with whom you have to compare yourself is you in the past.

Sigmund Freud

A pessimist is one who makes difficulties of his opportunities and an optimist is one who makes opportunities of his difficulties.

Harry Truman

With gratitude, optimism is sustainable.

MICHAEL J. FOX

A long life may not be good enough, but a good life is long enough.

BENJAMIN FRANKLIN

Those who bring sunshine into the lives of others cannot keep it from themselves.

JAMES M. BARRIE

The only person you are destined to become is the person you decide to be.

RALPH WALDO EMERSON

In nature, nothing exists alone.

RACHEL CARSON

Whatever the problem, be part of the solution. Don't just sit around raising questions and pointing out obstacles.

Tina Fey

I've been absolutely terrified every moment of my life and I've never let it keep me from doing a single thing I wanted to do.

GEORGIA O'KEEFFE