Jonas Salk

Hope lies in dreams, in imagination, and in the courage of those who dare to make dreams into reality.

Which is more important, the discovery of the polio vaccine or the discovery of the principle of vaccination?

There is no end to the discovery of the unknown.

The greatest reward for a man's toil is not what he gets for it, but what he becomes by it.

I have had a vision of a world in which the human species is in balance with nature, in which we live in harmony with each other, and in which we have a sense of purpose and meaning.

The reward for work well done is the opportunity to do more.

What some call health, others call illness.

The most important question we can ask is, 'What are we here for?'

I see a future in which we are all connected, in which we are all part of a global community, and in which we are all working together to create a better world.

The greatest discovery of all time is that a person can change his future by merely changing his attitude.

The only way to do great work is to love what you do.

I believe in the power of the human spirit to overcome adversity.

The greatest gift you can give someone is your time, your attention, your love, your concern.

The most important thing is to never stop questioning.

The future belongs to those who believe in the beauty of their dreams.

I am not interested in being famous. I am interested in being useful.

The greatest challenge facing humanity is to learn how to live together in peace and harmony.

The greatest tragedy is not death, but life without purpose.

The most important thing is to enjoy your life—to be happy—it's all that matters.

I believe that every human being has the potential to make a difference in the world.