Half Full of Half Empty

Optimistic people are those who have worked hard to force them out, and it means they've run out

I'm happy how Robert Schuller distinguish between an optimist and a pessimist. An optimist says the glass is half full of water "half full", a pessimist says "half empty." The reason is simple. An optimist poured water into a glass. A pessimist out of water out of the glass. It is a truth that applies worldwide. Every person who takes from society with no real effort to contribute to the public is pessimistic because he was afraid that the parts are not enough. People who mengusahakn best and memberika donations are optimistic and confident because he himself worked on solving the problem.

Source : zig ziglar1s little instruction book page 6