“Reply when questioned on the safety of the polio vaccine he developed:It is safe, and you can't get safer than safe.”

“Reply when questioned on the safety of the polio vaccine he developed:It is safe, and you can't get safer than safe.”

“Nothing happens quite by chance. It's a question of accretion of information and experience.”

“It is always with excitement that I wake up in the morning wondering what my intuition will toss up to me, like gifts from the sea. I work with it and rely on it. It's my partner.”

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

“I have had dreams and I have had nightmares, but I have conquered my nightmares because of my dreams.”

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

“Intuition will tell the thinking mind where to look next.”

“Some people are constructive, if you like. Others are destructive. It's this diversity in humankind that results in some making positive contributions and some negative contributions. It's necessary to have enough to make positive contributions to overcome the problems of each age.”

“When things get bad enough, then something happens to correct the course. And it's for that reason that I speak about evolution as an error-making and an error-correcting process. And if we can be ever so much better - ever so much slightly better - at error correcting than at error making, then we'll make it.”

“What makes your heart leap?”

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