"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."

"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."

"I was like a boy playing on the seashore."

"The wonderful arrangement and harmony of the cosmos could only have emerged from the plan of an omniscient and omnipotent Being."

"To explain all nature is too difficult a task for any one man or even for any one age. 'Tis much better to do a little with certainty, & leave the rest for others that come after you, than to explain …"