"I have spent more time fixing other men's mistakes than making my own."

"one of the most ingenious, simple pieces of mechanism I have contrived."

"Dr Priestly (sic) was once very ill with gall stones & was cured by abstinence from Butcher meat. ... fish & vegetables & butter or fat did not hurt him when taken in moderation, but his Doctors must …"

"In the mean time do all you can to cure him of Bashfullness which will ruin him in this impudent age; but beware he be not led into the opposite vice of self conceit or arrogance which is 1000 times w…"

"My great success in life has been owing to my having paid attention to every detail."