Nothing is destroyed until it is replaced.

nd now that man's history has been for the first time systematically considered as a whole, and has been found to be, like all other phenomena, subject to invariable laws, the preparatory labours of modern Science are ended.

Positivism is a theory of knowledge according to which the only kind of sound knowledge available to human kind is that if science grounded in observation.

The word right should be excluded from political language, as the word cause from the language of philosophy.

Every science consists in the coordination of facts; if the different observations were entirely isolated, there would be no science.

All good intellects have repeated, since Bacon's time, that there can be no real knowledge but which is based on observed facts.

To understand a science it is necessary to know its history.