Что вы мыслите о оптимистах и писсимистах? (их нрав, как они

Optimism (from the Latin. Optimus "best") a tendency throughout life to see the good side, believe in success and in successful outcome of something.

Pessimism is a bleak, bleak Outlook on life, a tendency to see everything in a gloomy light; sad mood.

In essence, optimism and pessimism are two sides of the same coin: obverse, light and joyful, and the reverse dark and gray.
However, in the dictionary there is another important term realism. It is the ability to clearly understand and realistically assess their environment when carrying something.
The optimist and the pessimist the two extremes between which lies the point of birth of the realist.
Realism comes when the expectation of good and bad in a person comes into a state of equilibrium.