"I have always been of the opinion, that the best way to discover the secrets of nature, is to interrogate her by experiments."

"I have often thought that the greatest obstacle to the progress of knowledge is the obstinacy of men in adhering to their old opinions."

"I have often been surprised to find how little care men take to preserve their health, and how much they neglect their souls."

"I have seen a piece of glowing wood continue to shine in a vacuum, proving that not all light requires air."

"I have often observed that those who are most eager to gain applause, are generally the least deserving of it."