Jonas Salk

The real question is not whether life exists after death. The real question is whether you are alive before death.

The purpose of the creative process is not to create something perfect, but to create something that has life.

We are all part of a larger, evolving process. We are nature becoming conscious of itself.

If all the insects were to disappear from the earth, within 50 years all life on earth would end. If all human beings disappeared from the earth, within 50 years all forms of life would flourish.

The ultimate wisdom is to know oneself and to act in accordance with that knowledge.

We are at a crossroads: one path leads to despair and utter hopelessness. The other, to total extinction. Let us pray we have the wisdom to choose correctly.

The most important thing we can do is to think about the future, because we are going to spend the rest of our lives there.

Biology is the science of the 21st century. Physics was the science of the 20th century.

The greatest revolution in our generation is the discovery that human beings, by changing the inner attitudes of their minds, can change the outer aspects of their lives.

The mind, like the body, can be strengthened with exercise.

What is important is to not stop questioning.

The true meaning of life is to plant trees, under whose shade you do not expect to sit.

I gave my discovery to the people. Could you patent the sun?

The process of discovery is not a straight line. It is a zigzag path.

We are not passive observers of evolution; we are participants and directors.

The next evolutionary step for humanity is a leap in consciousness.

When you are inspired by a great purpose, extraordinary projects, all your thoughts break their bonds.

The best way to predict the future is to invent it.

Health is a state of complete harmony of the body, mind and spirit.

The greatest danger in times of turbulence is not the turbulence; it is to act with yesterday's logic.