"In religion and politics, people's beliefs and convictions are in almost every case gotten at second-hand, and without examination."
"In the space of one hundred and seventy-six years the Mississippi has shortened itself two hundred and forty-two miles. Therefore ... in the Old Silurian Period the Mississippi River was upward of one million three hundred thousand miles long ... seven hundred and forty-two years from now the Mississippi will be only a mile and three-quarters long. ... There is something fascinating about science. One gets such wholesome returns of conjecture out of such a trifling investment of fact."
"It could probably be shown by facts and figures that there is no distinctly native American criminal class except Congress."
"It is better to keep your mouth shut and appear stupid than to open it and remove all doubt."
"It's not the size of the dog in the fight, it's the size of the fight in the dog."
"Let us endeavor so to live that when we come to die even the undertaker will be sorry."
"Never put off until tomorrow what you can do the day after tomorrow."
"None but the dead have free speech."
"October. This is one of the peculiarly dangerous months to speculate in stocks in. The others are July, January, September, April, November, May, March, June, December, August, and February."
"Only presidents, editors and people with tapeworm have the right to use the editorial 'we'."
"Substitute 'damn' every time you're inclined to write 'very'; your editor will delete it and the writing will be just as it should be."
"Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself."
"The citizen who sees his society's democratic clothes being worn out and does not cry out is not a patriot but a traitor."
"There are many humorous things in the world; among them, the white man's notion that he is less savage than the other savages."
"They did not know it was impossible, so they did it!"
"They spell it 'da Vinci' and pronounce it 'da Vinchy.' Foreigners always spell better than they pronounce."
"Whenever you find yourself on the side of the majority, it's time to pause and reflect."
"Every generalization is dangerous, especially this one."
"Writing is easy. All you have to do is cross out all the wrong words."
"The man who does not read good books has no advantage over the man who can't read them."
"The difference between the right word and the nearly right word is the same as that between lightning and the lightning bug."
"The difference between the almost right word and the right word is really a large matter — 'tis the difference between the lightning-bug and the lightning."
"Whiskey is for drinking. Water is for fighting over."