“1)A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.

2)Observation is a passive science, experimentation an active science.

3)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.

4)The investigator should have a robust faith - and yet not believe.

5)Mediocre men often have the most acquired knowledge.

6)Science does not permit exceptions.”