Many an optimist has become rich simply by buying out a pessimist.  ~ Laurence Peter
Don't wait until you feel positive to move forward.  Act your way into feeling good.  ~ John Maxwell
The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true.  James Cabell
Spare me the grim litany of the "realist."  Give me the unrealistic aspirations of the optimist any day.  ~ Colin Powell 
An optimist is a person who sees a green light everywhere, while the 
pessimist sees only the red stoplight.  The truly wise person is 
colorblind.  ~ Albert Schweitzer
Quotes about optimism, pessimism