Not found in Twain's works, this was attributed to him in Reader's Digest (September 1939): no prior attribution known. Mark Twain’s father died when Twain was eleven years old.
Disputed
Variant: When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years.
Mark Twain: Trending quotes (page 32)
Mark Twain trending quotes. Read the latest quotes in collection“"Classic." A book which people praise and don't read.”
Pudd'nhead Wilson's New Calendar, Ch. XXV
Following the Equator (1897)
Attributed to Twain but never sourced, this quotation should not be regarded as authentic.
Misattributed
“When you fish for love, bait with your heart, not your brain.”
Source: Notebook
“It is better to keep your mouth shut and appear stupid than to open it and remove all doubt.”
Cited as an example of "What Mark Twain Didn't Say" in Mark Twain by Geoffrey C. Ward, et al.
Misattributed
Variant: It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.
According to R. Ken Rasmussen in The Quotable Mark Twain (1998), this is most probably not Twain's.
Misattributed
“I have never let my schooling interfere with my education.”
Variant: Never let your schooling interfere with your education.
“Whenever you find that you are on the side of the majority, it is time to reform.”
Alternate (also Twain's): Whenever you find that you are on the side of the majority, it is time to pause and reflect.
Source: Mark Twain's Notebook (1935), p. 393
Concerning the Jews (Harper's Magazine, Sept. 1899)