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

“When I erase a word with a pencil, where does it go?”

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

“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.”

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

“Only the hand that erases can write the true thing.”

“Writing things down is dangerous. Ink can’t be erased without leaving a mess behind.”

“How to make God laugh? Tell Him your plans.”

“Just between you and me, have you ever been wrong? Are you divinely infallible? Are you different from the rest of us? Human nature is prone to error; the person who invented the pencil eraser knew that.”