Advice in problem solving:
“You must always invert.” — Carl Gustav Jacob Jacobi
“Whenever you can, count.” — Francis Galton
“Each problem that I solved became a rule, which served afterwards to solve other problems.” — Descartes
“By studying the masters, not their pupils.” — Niels Henrik Abel
“Truth is the offspring of silence and meditation. I keep the subject constantly before me and wait ’til the first dawnings open slowly, by little and little, into a full and clear light.” — Isaac Newton
“My own opinion is that belief is the death of intelligence. As soon as one believes a doctrine of any sort, or assumes certitude, one stops thinking about that aspect of existence. The more certitude one assumes, the less there is left to think about, and a person sure of everything would never have any need to think about anything and might be considered clinically dead under current medical standards, where the absence of brain activity is taken to mean that life has ended.” — Robert Anton Wilson
“I have always been of the opinion that unpopularity earned by doing what is right is not unpopularity at all but glory.” — Cicero
Meditations of Marcus Aurelius:
“The woes you have had to bear are numberless because you were not content to let Reason, your guide and master, do its natural work. Come now, no more of this!”
In a monastery cloisters on the edge of Venice is a sundial inscribed with the motto Horas non numero nisi serenas.
Literally that means “I don’t count the hours unless they are serene ones” (or “I count only the sunny hours”).
“But it really means, ‘When I come to die, the only moments that matter will have been the moments when I was at ease,'” writes Harry Mount in Amo, Amas, Amat and All That.
Of the motto, William Hazlitt wrote, “There is a softness and a harmony in the words and in the thought unparalleled.”
Sentenced in 1964 to life in prison, anti-apartheid activist Ahmed Kathrada got permission during his confinement to pursue a history degree through the University of South Africa. He used his access to books and writing materials to compile a series of secret notebooks in which he recorded quotations that inspired him. Together they form what used to be called a commonplace book — a series of personal memoranda that, taken together, illuminate the spirit of the compiler:
Ofttimes the test of courage becomes rather to live than to die. — Vittorio Alfieri
It is almost a definition of a gentleman to say he is one who never inflicts pain. — Cardinal Newman, The Idea of a University Defined (1873)
One owes respect to the living; but to the dead one owes nothing but the truth. — Voltaire
The triumph of wicked men is always short-lived. — Honore de Balzac, The Black Sheep
(Form of oath-taking among Shoshone Indians is:) The earth hears me. The sun hears me. Shall I lie?
Conrad wrote that life sometimes made him feel like a cornered rat waiting to be clubbed.
Nobody knows what kind of government it is who has never been in prison. — Leo Tolstoy
Leve fit, quod bene fertur onus. (A burden becomes lightest when it is well borne.)
To secure ourselves against defeat lies in our own hands, but the opportunity of defeating the enemy is provided by the enemy himself. — Sun Tzu
Verba volant, scripta manent. (The spoken word flees; the written word remains.) — Ancient Roman adage
(Peter Ustinov explains why he reads so much:) “If you’re going to be the prisoner of your own mind, the least you can do is to make sure it’s well furnished.”
To be without some of the things you want is an indispensable part of happiness. — Bertrand Russell
Altogether “Kathy” compiled seven notebooks over 26 years, drawing not just on his study materials and smuggled newspapers but on 5,000 books donated to the prison library by a Cape Town bookstore. Finally released in 1989, he went on to become a member of Parliament after South Africa’s first democratic elections in 1994 and served as President Nelson Mandela’s parliamentary counsellor until 1999.
One of his former warders, Christo Brand, told him, “I was supposed to be your master, but instead you became my mentor.”
(Sahm Venter, ed., Ahmed Kathrada’s Notebook From Robben Island, 2005.)
“Money is never spent to so much advantage as when you have been cheated out of it; for at one stroke you have purchased prudence.” — Schopenhauer
“Foreign nations are a contemporaneous posterity.”
— “A forgotten American essayist,” quoted by Brander Matthews in his introduction to The Oxford Book of American Essays, 1914
“Many discoveries are reserved for ages still to be, when our memory shall have perished. The world is a poor affair if it do not contain matter for investigation for the whole world in every age.” — Seneca
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