The No. 1 ‘hidden’ skill behind billionaire Bill Gates’ success—it works ‘in any field,’ says psychology expert

Optimism and pessimism are hard to deal with.

Pessimism is vital for survival, and it helps us prepare for risks before they arrive. But optimism is equally essential. The belief that things can — and will be — better even when the evidence is murky is one of the most essential parts of everything from a sound relationship to making a long-term investment.