I'm a pessimist because of intelligence, but an optimist because of will.

Antonio Gramsci 因为智力，我是一个悲观论者； 因为愿望，我是一个乐观主义者。

youdao

I'm a natural pessimist; I usually expect the worst.

我是个天生的悲观主义者，我总是往最坏的方面想。

《柯林斯英汉双解大词典》

Look, I said, I'm a born pessimist.

我说，我是一个天生的悲观主义者。

youdao

"I'm an optimist, and I think if you're a pessimist that's just an excuse for inaction."

VOA: standard.2010.02.24

A. Well, as I've had a lot of people tell me, I'm a pessimist, but also I--I wasn't prepared.

CNN: Transcripts from video deposition of Lewinsky, Jordan, and Blumenthal

"I'm a pessimist, " the 37-year-old Mr. Sayler said.

WSJ: Job Growth Loses Steam