If you think you can, you can. And if you think you can't, you're right. Mary Kay Ash

• optimism
• pessimism

Many an optimist has become rich simply by buying out a pessimist. Laurence Peter

• optimism
• pessimism

Never trouble trouble till trouble troubles you. Anonymous

• pessimism
• worry

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

• pessimism
• wisdom
• optimism
• positive thinking

There's no difference between a pessimist who says, "Oh, it's hopeless, so don't bother doing anything," and an optimist who says, "Don't bother doing anything, it's going to turn out fine anyway." Either way, nothing happens. Yvon Chouinard

• action
• optimism
• pessimism
• initiative

Don't let your imagination be crushed by life as a whole. Don't try to picture everything bad that could possibly happen. Stick with the situation at hand, and ask, "Why is this so unbearable? Why can't I endure it?" You'll be embarrassed to answer. Marcus Aurelius

• pessimism

This is the source.

Better to be occasionally cheated than perpetually suspicious. Bertie Forbes

• pessimism

If you think something's supposed to hurt, you're less likely to notice if you're doing it wrong. Paul Graham

• expectation
• pessimism

[S]kepticism and pessimism aren't synonymous. Skepticism calls for pessimism when optimism is excessive. But it also calls for optimism when pessimism is excessive. Howard Marks

• optimism
• pessimism

This is the source.