The doubter is a true man of science; he doubts only himself and his interpretations, but he believes in science. – Claude Bernard
Observation is a passive science, experimentation an active science. – Claude Bernard

The doubter is a true man of science; he doubts only himself and his interpretations, but he believes in science. – Claude Bernard
Observation is a passive science, experimentation an active science. – Claude Bernard
In teaching man, experimental science results in lessening his pride more and more by proving to him every day that primary causes, like the objective reality of things, will be hidden from him forever and that he can only know relations. – Claude Bernard
How thoroughly it is ingrained in mathematical science that every real advance goes hand in hand with the invention of sharper tools and simpler methods which, at the same time, assist in understanding earlier theories and in casting aside some more complicated developments. – David Hilbert