The only way to test a hypothesis is to look for all the information that disagrees with it.

While differing widely in the various little bits we know, in our infinite ignorance we are all equal.

Our belief in any particular natural law cannot have a safer basis than our unsuccessful critical attempts to refute it.

The old scientific ideal of episteme - of absolutely certain, demonstrable knowledge - has proved to be an idol. The demand for scientific objectivity makes it inevitable that every scientific statement must remain tentative for ever.

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.

There is no history of mankind, there are only many histories of all kinds of aspects of human life. And one of these is the history of political power. This is elevated into the history of the world.

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