"Arguing that you don't care about the right to privacy because you have
nothing to hide is no different than saying you don't care about free
speech because you have nothing to say."

--- Edward Snowden, 2015

"Logic is a science of the necessary laws of thought, without which no
employment of the understanding and the reason takes place."

--- Immanuel Kant, 1785

"'Contrariwise,' continued Tweedledee, 'if it was so, it might be; and
if it were so, it would be; but as it isn't, it ain't.  That's logic.'"

--- Lewis Carroll, Through the Looking Glass, 1871/1872

"Programming reliably -- must be an activity of an undeniably
mathematical nature […] You see, mathematics is about thinking, and
doing mathematics is always trying to think as well as possible."

--- Edsger W. Dijkstra, 1981

"I love deadlines.  I love the whooshing noise they make as they go by."

--- Douglas Adams, The Salmon of Doubt, 2002

"Be especially critical of any statement following the word
'obviously.'"

--- Anna Pell Wheeler, 1883-1966

"Mathematics takes us still further from what is human into the region
of absolute necessity, to which not only the actual world, but every
possible world, must conform."

--- Bertrand Russell, 1902

"Genius is 1% inspiration and 99% perspiration."

--- Thomas Alva Edison, 1932

"The introduction of suitable abstractions is our only mental aid to
organize and master complexity."

--- Edsger Wybe Dijkstra, 1930-2002

"It is no paradox to say that in our most theoretical moods we may be
nearest to our most practical applications."

--- Alfred North Whitehead, 1861-1947

"The power of mathematics rests on its evasion of all unnecessary
thought."

--- Ernst Mach, 1838-1916

"The whole science is nothing more than a refinement of everyday
thinking."

--- Albert Einstein, 1879-1955

"One can begin to reason only when a clear picture has been formed in
the imagination."

--- Walter Warwick Sawyer, Mathematician's Delight, 1943

"Thinking is a momentary dismissal of irrelevancies."

--- Richard Buckminster Fuller, 1969

"Simplicity is complexity resolved."

--- Constantin Brâncuși, 1876-1957

"Chop your own wood and it will warm you twice."

--- Henry Ford; Francis Kinloch, 1819; Henry David Thoreau, 1854

"'Obvious' is all too often a synonym for 'wrong'."

--- Jeff Erickson, Algorithms, 2019

"All you have to do is write one true sentence.  Write the truest
sentence that you know."

--- Ernest Miller Hemingway (1899-1961)

"If you're thinking without writing, you only think you're thinking."

--- Leslie Lamport

"It is far better to have a question that can't be answered than an
answer that can't be questioned."

--- Carl Sagan

"Great minds discuss ideas; average minds discuss events; small minds
discuss people."

--- Anna Eleanor Roosevelt (1884-1962)

"We shall not cease from exploration
 And the end of all our exploring
 Will be to arrive where we started
 And know the place for the first time"

--- T. S. Eliot, Little Gidding, Four Quarters, 1943

"Those who cannot remember the past are condemned to repeat it."

--- George Santayana, Life of Reason: Reason in Common Sense, 1905

"I do not fear death.  I had been dead for billions and billions of
years before I was born, and had not suffered the slightest
inconvenience from it."

--- Mark Twain, paraphrased

"All of humanity's problems stem from man's inability to sit quietly in
a room alone."

--- Blaise Pascal, Pensées, 1670

"I have only made this letter longer because I have not had the time to
make it shorter."

--- Blaise Pascal, The Provincial Letters, 1657

"An intelligent hell would be better than a stupid paradise."

--- Victor Hugo, Ninety-Three (1874)

"It is better to have 100 functions operate on one data structure than
10 functions on 10 data structures."

--- Alan Perlis

"For every problem you can't solve, there's a simpler problem that you
also can't solve."

--- Hendrik Lenstra

"It is not the strongest of the species that survives, not the most
intelligent that survives. It is the one that is the most adaptable to
change."

--- Charles Darwin

"To the unknown journeyman
 I promise to show courage
 in upholding my vows

 What is an adventure
 if not the commitment
 to keep going?"

--- Protesilaos Stavrou, To the unknown journeyman, 2025

"Thorny rose
 beautiful and untouchable
 like the dreams

 I never dared to pursue
 you are the flower
 my garden was made for"

--- Protesilaos Stavrou, Rose, 2025

There are only two hard things in computer science: cache invalidation and naming things.

--- Phil Karlton

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors.

--- Phil Karlton, Leon Bambrick (off-by-one part)