Optimism is invaluable for the meaningful life. With a firm belief in a positive future, you can throw yourself into the service of that which is larger than you are.

Psychologists
Martin Seligman
U.S. psychologist (b.1942). Discovered learned helplessness in 1967, founded positive psychology as 1998 APA president, and proposed the PERMA model. His role in the CIA Enhanced Interrogation case is a noted dispute.
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Martin Seligman's Other Quotes
Learned helplessness is the giving-up reaction, the quitting response that follows from the belief that whatever you do doesn't matter.
Well-being cannot exist just in your own head; well-being is a combination of feeling good as well as actually having meaning, good relationships and accomplishment.
The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault.
The good life consists in deriving happiness by using your signature strengths every day in the main realms of living.
Related Quotes
The first thing we can say of life is that it is a nexus.
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Storytelling reveals meaning without committing the error of defining it.
-- Hannah Arendt
The meaning of a word is its use in the language.
-- Ludwig Wittgenstein
I'd rather be optimistic and wrong than pessimistic and right.
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Business opportunities are like buses, there's always another one coming.
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I have always been delighted at the prospect of a new day, a fresh try, one more start.
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