Karl Popper

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.

Piecemeal social engineering resembles physical engineering in regarding the ends as beyond the province of technology.

When the market goes to hell, it's more of an opportunity than a problem.

I feel sorry for generations of Labour voters and supporters who must look and wonder what on earth has gone wrong and what Labour is for.

In a republic, that paradise of debility, the politician is a petty tyrant who obeys the laws.