“No man but a blockhead ever wrote, except for money.”

“Getting money is not all a man's business: to cultivate kindness is a valuable part of the business of life.”

“I had done all that I could, and no Man is well pleased to have his all neglected, be it ever so little.”

“It is all work, and my inducement to it is not love or desire of fame, but the want of money, which is the only motive to writing that I know of.”

“Money and time are the heaviest burdens of life . . . the unhappiest of all mortals are those who have more of either than they know how to use.”

“There is no problem the mind of man can set that the mind of man cannot solve.”

“Nothing [...] will ever be attempted, if all possible objections must be first overcome.”