Philosophy of science without history of science is empty; history of science without philosophy of science is blind.

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.

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.

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

If even in science there is no a way of judging a theory but by assessing the number, faith and vocal energy of its supporters, then this must be even more so in the social sciences: truth lies in power.

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

Blind commitment to a theory is not an intellectual virtue: it is an intellectual crime.