Optimism and Pessimism

"Clouds may come, but clouds must go, and they all have a silver lining. For behind each cloud you know, the sun, or moon, is shining".

Therefore, to be optimistic or pessimistic is up to us as is the case with oft quoted example, that is, the glass may be seen by observer as half full and may be viewed as half empty.

Basically, It is the approach of viewing things that matters and makes our life beautiful or ugly.