Optimism

Optimism is defined by Martin Selligman, the author of Learned Optimism, as a habit of thinking positively, feeling proud of one's achievements, and seeing failures as challenges instead of giving up. It is an attitude that one has control over one's destiny.
Antonym: helplessness.

The dictionary says it means an inclination to put things in a favorable perspective and to anticipate the best possible outcome. It is from Latin and is related to the word opulence.

Opulence- - wealth, affluence; abundance; luxury.