My life is pretty well at peace, and the profession is more of an avocation. It's a calling, if you like, rather than a job. I do what I feel impelle… - Jonas Salk

Reply when questioned on the safety of the polio vaccine he developed:

It is safe, and you can't get safer than safe.

Reason alone will not serve. Intuition alone can be improved by reason, but reason alone without intuition can easily lead the wrong way. They both are necessary. The way I like to put it is that when I have an intuition about something, I send it over to the reason department. Then after I've checked it out in the reason department, I send it back to the intuition department to make sure that it's still all right. That's how my mind works, and that's how I work. That's why I think that there is both an art and a science to what we do. The art of science is as important as so-called technical science. You need both. It's this combination that must be recognized and acknowledged and valued.

Parte de la gran inquietud y de los trastornos del mundo actual se deben no tanto al cambio mismo como al paso acelerado en que se produce el cambio.