This glass is full...

"This glass is full. Half water + half air = full glass" will be my answer if some one ask me whether this glass is half empty or half full. We all come to this world with pessimism and optimism as the character traits.Our view towards the world decides whether we are optimist or pessimist. We all have the choice to make ourself as the victim of the experiences in our life or the creator of them. Because experience does not happen to us, it happens through us. 

Too much of pessimism/optimism is contagious, but people run away from the ones who have too much of pessimism.  "The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails " said W.A. Ward.
 An optimist would see only unlimited potential, a pessimist might see unattainable potential. Some times the experiences in life turn us to be a pessimistic. But we can break the pattern because we are the ones who forms the pattern.

"We are what we think.

All that we are arises with our thoughts. 

With our thoughts we make the world.

Speak or act with an impure mind

And trouble will follow you.

Speak or act with a pure mind

And happiness will follow you

As your shadow, unshakable."

   --Gautama Buddha