"The best and safest method of philosophizing seems to be, first to inquire diligently into the properties of things, and to establish those properties by experiments, and then to proceed more slowly t…"

"He that in the study of natural philosophy shall resolve to proceed upon nothing but demonstrations and sound knowledge, hath a very large field of materials of all sorts to divert and employ him."

"I can calculate the motion of heavenly bodies, but not the madness of people."

"The way to chastity is not to struggle directly with incontinent thoughts but to avert the thoughts by some employment, or by reading, or by meditating on other things."

"No great discovery was ever made without a bold guess."