The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error.

The quest for precision is analogous to the quest for certainty and both - precision and certainty are impossible to attain.

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

I personally call the type of government which can be removed without violence 'democracy,' and the other, 'tyranny.'.

Our aim must be to make our successive mistakes as quickly as possible. To speed up evolution.

The scientific tradition is distinguished from the pre-scientific tradition by having two layers. Like the latter, it passes on its theories; but it also passes on a critical attitude towards them.

Every genuine test of a theory is an attempt to falsify it, or to refute it.