Man's respect for knowledge is one of his most peculiar characteristics. Knowledge in Latin is scientia, and science came to be the name of the most respectable kind of knowledge.

Indeed, this epistemological theory of the relation between theory and experiment differs sharply from the epistemological theory of naive falsificationism.

That sometimes clear ... and sometimes vague stuff ... which is ... mathematics.

Einstein's results again turned the tables and now very few philosophers or scientists still think that scientific knowledge is, or can be, proven knowledge.

There is no falsification before the emergence of a better theory.

The positive heuristic of the programme saves the scientist from becoming confused by the ocean of anomalies.

Intellectual honesty consists in stating the precise conditions under which one will give up one's belief.