Albert Einstein:

Try not to become a man of success but rather try to become a man of value.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

There are no gains without pains.

It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.

Success consists of going from failure to failure without loss of enthusiasm.

All the world is a stage,
And all the men and women merely players.
They have their exits and entrances;
Each man in his time plays many parts.

The purpose of life is a life of purpose.

Never forget that the purpose for which a man lives is the improvement of the man himself, so that he may go out of this world having, in his great sphere or his small one, done some little good for his fellow creatures and labored a little to diminish the sin and sorrow that are in the world.

John F. Kennedy:

Ask not what your country can do for you, but what you can do for your country.

Everybody can be great... because anybody can serve. You don't have to have a college degree to serve. You don't have to make your subject and verb agree to serve. You only need a heart full of grace. A soul generated by love.

Pablo Picasso:

My mother said to me, "If you become a soldier, you'll be a general; if you become a monk, you'll end up as the Pope." Instead, I became a painter and wound up as Picasso.