“Oh, Diamond! Diamond! thou little knowest what mischief thou hast done!”

“Geometry was invented that we might expeditiously avoid, by drawing Lines, the Tediousness of Computation.”

“God created everything by number, weight and measure.”

“But if I have done the public any service this way, 'tis due to nothing but industry and a patient thought.”

“I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis, and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.”

“Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things.”

“A happy life consists not in the absence, but in the mastery of hardships.”

“No doubt the reason is that character cannot be developed in ease and quiet. Only through experience of trial and suffering can the soul be strengthened, vision cleared, ambition inspired, and success achieved.”

“Believe, when you are most unhappy, that there is something for you to do in the world. So long as you can sweeten another's pain, life is not in vain.”

“You gain strength, courage, and confidence by every experience in which you really stop to look fear in the face. You are able to say to yourself, 'I have lived through this horror. I can take the next thing that comes along.' You must do the thing you think you cannot do.”

“You must not lose faith in humanity. Humanity is an ocean; if a few drops of the ocean are dirty, the ocean does not become dirty.”

“Strength does not come from physical capacity. It comes from an indomitable will.”