Every solution of a problem raises new unsolved problems.

It must be possible for an empirical system to be refuted by experience.

Thus science must begin with myths, and with the criticism of myths; neither with the collection of observations, nor with the invention of experiments, but with the critical discussion of myths, and of magical techniques and practices.

Philosophers should consider the fact that the greatest happiness principle can easily be made an excuse for a benevolent dictatorship. We should replace it by a more modest and more realistic principle - the principle that the fight against avoidable misery should be a recognized aim of public policy, while the increase of happiness should be left, in the main, to private initiative.

The attempt to make heaven on earth invariably produces hell.

Good tests kill flawed theories; we remain alive to guess again.

We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.