“A fool is someone whose pencil wears out before its eraser does.”

“The tools of the academic designer are a piece of paper and a pencil with an eraser. If a mistake is made, it can always be erased and changed. If the practical-reactor designer errs, he wears the mistake around his neck; it cannot be erased. Everyone sees it.”

“Write your plans in pencil and give God the eraser.”

“We all make mistakes. That's why my pencil has an eraser.”

“And as for those who voted for me, I know there will be many whose pencils hovered for an instant before putting an X in my box and I will work flat out to repay and to justify your confidence.”

“My death will not be penciled on someone's calendar.”

“I have rewritten — often several times — every word I have ever published. My pencils outlast their erasers.”

“Tain't worthwhile to wear a day all out before it comes.”

“Find me now. Before someone else does.”

“Tis better people think you a fool, then open your mouth and erase all doubt.”