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Hello, Happy New Year to you.
Optimism is as valid a response as any other to a universe that is unpredictable, uncontrollable and chaotic. There is no meaning or logic to what happens to us in life, we can't control the forces that shape our lives. Once a person resigns themselves to their fate, it's the beginning of maturity and self acceptance. To struggle against a universe that is indifferent to our happiness is undignified, ludicrous and pointless.
Therefore "Prepare for the worst, hope for the best" is the closest thing to a sane response to an insane, meaningless world I've managed to come up with.
So to conclude as I began, optimism is as reasonable as anything in a world where we are the sport of forces beyond our control. I therefore wish you all (except for arseholes, go fuck yourselves, may you die and be damned) the best of the New Year ahead.