I collect my favorites from various sources, though I was reminded of many of these quotes by The Quotations Page (which offers quotes of the day).  There is a condensed book in every good quote:

Whatever you do will be insignificant, but it is very important that you do it.
Mahatma Gandhi (1869 – 1948)

With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion.
Steven Weinberg (1933 – ), quoted in The New York Times, April 20, 1999

I’ve always found paranoia to be a perfectly defensible position.
Pat Conroy (1945 – )

It’s not a matter of whether or not someone’s watching over you. It’s just a question of their intentions.
Randy K. Milholland, Something Positive, 03-24-07

In mathematics you don’t understand things. You just get used to them.
Johann von Neumann (1903 – 1957)

It has been my experience that folks who have no vices have very few virtues.
Abraham Lincoln (1809 – 1865)

To do just the opposite is also a form of imitation.
Georg Christoph Lichtenberg (1742 – 1799)

Happiness in intelligent people is the rarest thing I know.
Ernest Hemingway (1899 – 1961)

Men have become the tools of their tools.
Henry David Thoreau (1817 – 1862)

Science without religion is lame, religion without science is blind.
Einstein

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.
The Dalai Lama (1935 – )

The older I grow, the less important the comma becomes. Let the reader catch his own breath.
Elizabeth Clarkson Zwart

The most erroneous stories are those we think we know best – and therefore never scrutinize or question.
Stephen Jay Gould (1941 – 2002)

I am returning this otherwise good typing paper to you because someone has printed gibberish all over it and put your name at the top.
An English Professor, Ohio University

A happy childhood is poor preparation for human contacts.
Colette (1873 – 1954)

Reality is that which, when you stop believing in it, doesn’t go away.
Philip K. Dick (1928 – 1982), Do Androids Dream of Electric Sheep?

If this is coffee, please bring me some tea; but if this is tea, please bring me some coffee.
Abraham Lincoln (1809 – 1865)

The remarkable thing about Shakespeare is that he really is very good, in spite of all the people who say he is very good.
Robert Graves (1895 – 1985)

Great minds think differently.
t-shirt

No matter what side of the argument you are on, you always find people on your side that you wish were on the other.
Jascha Heifetz (1901 – 1987)

The reason why so few good books are written is that so few people who can write know anything.
Walter Bagehot (1826 – 1877)

In preparing for battle I have always found that plans are useless, but planning is indispensable.
Dwight D. Eisenhower (1890 – 1969)

It is always easier to believe than to deny. Our minds are naturally affirmative.
John Burroughs (1837 – 1921)

One can always be kind to people about whom one cares nothing.
Oscar Wilde (1854 – 1900), The Picture of Dorian Gray, 1891

It is the mark of an educated mind to be able to entertain a thought without accepting it.
Aristotle (384 BC – 322 BC)

I don’t mind what language an opera is sung in so long as it is a language I don’t understand.
Sir Edward Appleton (1892 – 1965)

Man is the only animal that laughs and has a state legislature.
Samuel Butler (1835 – 1902)

Rage is the only quality which has kept me, or anybody I have ever studied, writing columns for newspapers.
Jimmy Breslin

Too many have dispensed with generosity in order to practice charity.
Albert Camus (1913 – 1960)

An idealist is a person who helps other people to be prosperous.
Henry Ford (1863 – 1947)

I like to believe that people in the long run are going to do more to promote peace than our governments. Indeed, I think that people want peace so much that one of these days governments had better get out of the way and let them have it.
Dwight D. Eisenhower (1890 – 1969)

Education is what survives when what has been learned has been forgotten.
B. F. Skinner (1904 – 1990), New Scientist, May 21, 1964

Most people have seen worse things in private than they pretend to be shocked at in public.
Edgar Watson Howe (1853 – 1937)

Freedom of the press is limited to those who own one.
A. J. Liebling (1904 – 1963)

“We do not inherit the world from our ancestors; we borrow it from our children.” Navajo proverb

It is forbidden to kill; therefore all murderers are punished unless they kill in large numbers and to the sound of trumpets.
  – Voltaire