But not only medicine, engineering, and painting are arts; living itself is an art in fact, the most important and at the same time the most difficult and complex art to be practiced by man.

Immature love says: 'I love you because I need you.' Mature love says 'I need you because I love you.'

Greed is a bottomless pit which exhausts the person in an endless effort to satisfy the need without ever reaching satisfaction.

It takes a moment to tell someone you love them, but it takes a lifetime to prove it.

Love isn't something natural. Rather it requires discipline, concentration, patience, faith, and the overcoming of narcissism. It isn't a feeling, it is a practice.

Creativity requires the courage to let go of certainties.

Man's main task in life is to give birth to himself, to become what he potentially is. The most important product of his effort is his own personality.

The lust for power is not rooted in strength but in weakness.

The task we must set for ourselves is not to feel secure, but to be able to tolerate insecurity.

The scars left from the child's defeat in the fight against irrational authority are to be found at the bottom of every neurosis.

To love somebody is not just a strong feeling - it is a decision, it is a judgment, it is a promise.

The best way to forget ones self is to look at the world with attention and love.

If all of us acted in unison as I act individually there would be no wars and no poverty. I have made myself personally responsible for the fate of every human being who has come my way.

It's not just a matter of whether you support Obama or Romney. It's who they have coming with them. I always keep my powder dry, as they say in the military.

I met a man once who told me that far from believing in the square root of minus one, he didn't believe in minus one. This is at any rate a consistent attitude.

Chess is a curse upon a man.

The cloudy weather melts at length into beauty, and the brightest smiles of the heart are born of its tears.

The most dangerous poison is the feeling of achievement. The antidote is to every evening think what can be done better tomorrow.

I did it once in high school - I was Sandy in Grease - and I decided then that I would never do it again. I've felt that way for years, and that's no bullshit.

Life is not orderly. No matter how we try to make it so, right in the middle of it we die, lose a leg, fall in love, or drop a jar of applesauce.

There are buoyant powers of healing at work in the world that do not depend on us, that we need not finance or keep functioning and that are not at our disposal.