We generally just think of optimism and pessimism as just feelings and emotions. But they're the simple things that make a huge difference in our health.

The mind is an intricate mechanism that can be run on the fuels of both victory and defeatism.

Optimism is denial for chumps with no life experience".
"What's pessimism?" I said.
"Religion without God.

So desperate was Kugel for things to turn out for the best, proclaimed Professor Jove, that he couldn't stop worrying about the worst. Hope, said Professor Jove, was Solomon Kugel's greatest failing.

I will be the first to admit that I am a pessimist by nature. It is, after all, the wisest way to be. We pessimists have everything to gain, whereas optimists have a fifty-fifty chance of being disappointed.

The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.