Seeking and concentrating on the positive in a given situation and in life in general, isn't just about being positive for the sake of it ... for me, it's the belief in this hope, (the hope that things will work out and that everything happens for a reason), that is the only thing that keeps me going, hanging on, believing and not giving up or in to the temptation that is the darkness of defeatism.
This Leunig masterpiece is a constant reminder to me of this:

.. And when the 'bright side' is no where to be found - make it up, create it.