There is hope in dreams, imagination, and in the courage of those who wish to make those dreams a reality. - Jonas Salk

I was told I could, if I wished, switch and get a Ph.D. in biochemistry but my preference was to stay with medicine. And I believe that this is all linked to my original ambition, or desire, which was to be of some help to humankind, so to speak, in a larger sense than just on a one-to-one basis. Just as I intended to study law, to make just laws, so I found myself interested now in the laws of nature, as distinct from the laws the people make.

Know what is the purpose of life that you are inclined to serve, that you are drawn to. Do what makes your heart leap rather than simply follow some style or fashion. Not everyone can or should be a scientist. Not everyone can or should be any one thing. People need to know what kind of purpose they can serve.

The idea of being constructive, creative, positive, in trying to bring out the best in one's own self and the best in others follows from what I've just been saying. Again, I repeat my belief in us, in ourselves, as the product of the process of evolution, and part of the process itself. I think of evolution as an error-making and error-correcting process, and we are constantly learning from experience. It's the need to dedicate one's self in that way, to one's own self, and to choose an activity or life that is of value not only to yourself but to others as well.