“The attack of irrationalism upon argument has been going on through all these sixty years in more than sixty fashions. The pretext of ethnic provocation is the meanest and most revolting one of all, but not the newest. Quite possibly it is the oldest. This is not much comfort. But at least we need not accept that there is here – or elsewhere – a historical tendency for things to become worse. The future depends upon ourselves. It is we who bear all the responsibility.
For this reason, an important principle holds: It is our duty to remain optimists. Perhaps I should explain this in a few words before ending these notes.
The future is open. It is not predetermined and thus cannot be predicted – except by accident. The possibilities that lie in the future are infinite. When I say \'It is our duty to remain optimists”, this includes not only the openness of the future but also that which all of us contribute to it by everything we do: we are all responsible for what the future holds in store.
Thus it is our duty, not to prophesy evil, but, rather, to fight for a better world.”
Karl Popper, \'The Myth of the Framework\'.