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My pessimism goes to the point of suspecting the sincerity of the pessimists.

My pessimism extends to the point of even suspecting the sincerity of other pessimists.

One has to have the courage of one's pessimism.

Pessimism, when you get used to it, is just as agreeable as optimism.

There's probably a little greater case for pessimism than optimism. But I do not rule out optimism.

I'm not pessimistic about anything.

Pessimism only describes an attitude, and not facts, and hence is entirely subjective.

I weirdly do consider myself an optimist about love.

If you're speaking of love, you really must include the element of uncertainty - and perhaps it's best approached as the art of constant maintenance.