In short, the optimist to the core, pushes away pessimism with
the sheer force of their optimism. When something sounds good,
they believe it and go with it completely. They're quicker to
trust, even though they don't always think so or see it. They
complain a lot because, at the core, they believe the world
shouldn't be as it is... and they really believe it can get
better.
But a pessimist to the core, pushes away pessimism by HEALING:
patching up the pessimism with a coating of optimism, or digging
DEEP to the cancer of pessimism and extracting it... putting
ointment in the wounds, all the while saying, "You'll be fine!"
until the patient believes it... all the while thinking, "I hope
the patient doesn't die".
A pessimist _hopes_ it gets better, but doesn't expect it.