No one has yet been found so firm of mind and purpose as resolutely to compel himself to sweep away all theories and common notions, and to apply the understanding, thus made fair and even, to a fresh examination of particulars. Thus it happens that human knowledge, as we have it, is a mere medley and ill-digested mass, made up of much credulity and much accident, and also of the childish notions which we at first imbibed.

Those who have handled sciences have been either men of experiment or men of dogmas. The men of experiment are like the ant, they only collect and use; the rea…

Another argument of hope may be drawn from this - that some of the inventions already known are such as before they were discovered it could hardly have entere…

But by far the greatest obstacle to the progress of science and to the undertaking of new tasks and provinces therein is found in this - that men despair and t…

Science is feasible when the variables are few and can be enumerated; when their combinations are distinct and clear. We are tending toward the condition of sc…

But man has still another powerful resource: natural science with its strictly objective methods.

La verdadera ciencia ensena, por encima de todo, a dudar y a ser ignorante.