"Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful."
"The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic."
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Source: Albert Schweitzer (1953). “Out of My Life and Thought: An Autobiography: Postscript 1932-1949 by Everett Skillings”
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