The investigator should have a robust faith - and yet not believe. Claude Bernard on faith
Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave. Claude Bernard on imagination
Mediocre men often have the most acquired knowledge. Claude Bernard on knowledge
It is what we know already that often prevents us from learning. Claude Bernard on learning
Observation is a passive science, experimentation an active science. Claude Bernard on science
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 on science
Experimentation is an active science. Claude Bernard on science
Science does not permit exceptions. Claude Bernard on science