This from an inpromptu speech given to the White House staff on the day that he left office.
"Always give your best, never get discouraged, never be petty; always remember, others may hate you, but those who hate you don't win unless you hate them, and then you destroy yourself." - Richard Nixon - August 9, 1974
This one is just funny. I don't know when it was given.
"I wouldn't bet the farm on it, but I'd bet the main house. I wouldn't even bet the outhouse on Mondale. - Richard M. Nixon