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" "It is courage based on confidence, not daring, and it is confidence based on experience.
Jonas Salk (October 28 1914 – June 23 1995) was a medical researcher and author, the inventor of the Salk vaccine against Polio, and the founder of the Salk Institute for Biological Studies.
Biography information from Wikiquote
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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.