"I have always regarded the study of nature as the most noble and elevated of pursuits."

"Imagination, on the contrary, which is ever wandering beyond the bounds of truth, joined to self-love and that self-confidence we are so apt to indulge, prompt us to draw conclusions which are not imm…"

"The true philosopher is he who knows how to doubt."

"It is not given to every man to be a Newton, but every man can be useful to society."

"The greatest obstacle to discovery is not ignorance, but the illusion of knowledge."