The greatest satisfaction comes from knowing you've made a d... - Jonas Salk

"The greatest satisfaction comes from knowing you've made a difference in someone's life."

Jonas Salk Happiness

Virologist and Immunologist American 1914–1995

More from Jonas Salk

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

"Life is an adventure in forgiveness."

"Hope lies in dreams, in imagination, in the courage of those who dare to try."

"Our greatest responsibility is to be good ancestors."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."