Oh, there are too many to include here! But a few of my favorite quotes are engraved on silver bracelets that I wear every day. They are:
Life is either a daring adventure or nothing at all - Helen Keller
It's never too late to be what you might have been - George Elliot
Be the change that you want to see in the world - Mahatma Gandhi
Two others that have great meaning for me are from Goethe and Marianne Williamson.
From Goethe: "Whatever you do, or dream you can, begin it. Boldness has genius and power and magic in it."
And from Marianne: "Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us. We ask ourselves, Who am I to be brilliant, gorgeous, talented, fabulous? Actually, who are you not to be? You are a child of God. Your playing small does not serve the world. There is nothing enlightened about shrinking so that other people won't feel insecure around you. We are all meant to shine, as children do. We were born to make manifest the glory of God that is within us. It's not just in some of us; it's in everyone. And as we let our own light shine, we unconsciously give other people permission to do the same. As we are liberated from our own fear, our presence automatically liberates others."