Man, at least when educated, is a pessimist. He believes it safer not to reflect on his achievements; Jove is known to strike such people down.

Actually he was a pessimist, and, like all pessimists, a ridiculously unobservant man.

I know too much and not enough

- Vous êtes plus pessimiste qu'autrefois ?
- Pessimisme et optimisme, encore deux mots que je récuse. Il s'agit d'avoir les yeux ouverts. Le médecin qui analyse le sang et les selles d'un malade, mesure sa fièvre et prend sa tension, n'est ni optimiste ni pessimiste : il fait de son mieux à partir de ce qui est. Mais, si l'on peut employer ce misérable mot, je me sens pessimiste quand je constate combien la masse humaine a peu changé depuis des millénaires. Les plus grands réformateurs se sont généralement heurtés à cette quasi-impossibilité de changer l'homme, et leur leçon s'est généralement perdue après eux. (p.240)

The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.

A pessimist is one who makes difficulties of his opportunities and an optimist is one who makes opportunities of his difficulties.

A pessimist is somebody who complains about the noise when opportunity knocks.

"What is an optimist? The man who says, "It's worse everywhere else. We're better off than the rest of the world. We've been lucky." He is happy with things as they are and he doesn't torment himself.

What is a pessimist? The man who says, "Things are fine everywhere but here. Everyone else is better off than we are. We're the only ones who've had a bad break." He torments himself continually."

One knows so little. When one knows more it is too late.

The pessimist resembles a man who observes with fear and sadness that his wall calendar, from which he daily tears a sheet, grows thinner with each passing day. On the other hand, the person who attacks the problems of life actively is like a man who removes each successive leaf from his calendar and files it neatly and carefully away with its predecessors, after first having jotted down a few diary notes on the back. He can reflect with pride and joy on all the richness set down in these notes, on all the life he has already lived to the fullest. What will it matter to him if he notices that he is growing old? Has he any reason to envy the young people whom he sees, or wax nostalgic over his own lost youth? What reasons has he to envy a young person? For the possibilities that a young person has, the future which is in store for him?

No, thank you,' he will think. 'Instead of possibilities, I have realities in my past, not only the reality of work done and of love loved, but of sufferings bravely suffered. These sufferings are even the things of which I am most proud, although these are things which cannot inspire envy.

The optimists and the pessimists: I have been studying them for the past twenty-five years. The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault. The optimists, who are confronted with the same hard knocks of this world, think about misfortune in the opposite way. They tend to believe defeat is just a temporary setback, that its causes are confined to this one case. The optimists believe defeat is not their fault: Circumstances, bad luck, or other people brought it about. Such people are unfazed by defeat. Confronted by a bad situation, they perceive it as a challenge and try harder.

People assume it’s a matter of personality, the difference between optimists and pessimists. But I believe it all comes down to an inability to forget. The greater your powers of retention, the slimmer your chances at optimism.

the hopelessness that comes from knowing too little and feeling too much (so brittle, so dry he is in danger of the reverse: feeling nothing and knowing everything)

I am by nature an optimist and by intellectual conviction a pessimist.