Your glass seems like it will always be half full even it falls down and shatters to pieces.
Seeing the glass as half empty is more positive than seeing it as half full. Through such a lens the only choice is to pour more. That is righteous pessimism.
Although the world is full of suffering, it is full also of the overcoming of it. My optimism, then, does not rest on the absence of evil, but on a glad belief in the preponderance of good and a willing effort always to cooperate with the good, that it may prevail.
To run this business ... you need ... optimism, humanism, enthusiasm, intuition, curiosity, love, humour, magic and fun, and that secret ingredient - euphoria.